Merge feature/issue-22919.3b1

38 files changed, 1154 insertions, 273 deletions

diff --git a/CHANGES.txt b/CHANGES.txt
index 7ed7434b..339b137d 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -2,6 +2,13 @@
 CHANGES
 =======
 
+----
+19.3
+----
+
+* Issue #229: Implement new technique for readily incorporating
+  dependencies conditionally from vendored copies or primary
+  locations. Adds a new dependency on six.
 
 ----
 19.2
diff --git a/MANIFEST.in b/MANIFEST.in
index 8a4523a9..dfea2049 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -3,6 +3,7 @@ recursive-include tests *.py
 recursive-include setuptools/tests *.html
 recursive-include docs *.py *.txt *.conf *.css *.css_t Makefile indexsidebar.html
 recursive-include _markerlib *.py
+recursive-include setuptools/_vendor *
 recursive-include pkg_resources *.py *.txt
 include *.py
 include *.txt
diff --git a/Makefile b/Makefile
index 37dd26eb..353b987e 100644
--- a/Makefile
+++ b/Makefile
@@ -2,6 +2,7 @@ empty:
 	exit 1
 
 update-vendored:
-	rm -rf pkg_resources/_vendor/packaging
-	pip install -r pkg_resources/_vendor/vendored.txt -t pkg_resources/_vendor/
+	rm -rf pkg_resources/_vendor/packaging*
+	rm -rf pkg_resources/_vendor/six*
+	python3 -m pip install -r pkg_resources/_vendor/vendored.txt -t pkg_resources/_vendor/
 	rm -rf pkg_resources/_vendor/*.{egg,dist}-info
diff --git a/pkg_resources/__init__.py b/pkg_resources/__init__.py
index b55e4127..7becc951 100644
--- a/pkg_resources/__init__.py
+++ b/pkg_resources/__init__.py
@@ -37,7 +37,6 @@ import plistlib
 import email.parser
 import tempfile
 import textwrap
-import itertools
 from pkgutil import get_importer
 
 try:
@@ -46,23 +45,8 @@ except ImportError:
     # Python 3.2 compatibility
     import imp as _imp
 
-PY3 = sys.version_info > (3,)
-PY2 = not PY3
-
-if PY3:
-    from urllib.parse import urlparse, urlunparse
-
-if PY2:
-    from urlparse import urlparse, urlunparse
-    filter = itertools.ifilter
-    map = itertools.imap
-
-if PY3:
-    string_types = str,
-else:
-    string_types = str, eval('unicode')
-
-iteritems = (lambda i: i.items()) if PY3 else lambda i: i.iteritems()
+from pkg_resources.extern import six
+from pkg_resources.extern.six.moves import urllib
 
 # capture these to bypass sandboxing
 from os import utime
@@ -87,16 +71,13 @@ try:
 except ImportError:
     pass
 
-try:
-    import pkg_resources._vendor.packaging.version
-    import pkg_resources._vendor.packaging.specifiers
-    packaging = pkg_resources._vendor.packaging
-except ImportError:
-    # fallback to naturally-installed version; allows system packagers to
-    #  omit vendored packages.
-    import packaging.version
-    import packaging.specifiers
+from pkg_resources.extern import packaging
+__import__('pkg_resources.extern.packaging.version')
+__import__('pkg_resources.extern.packaging.specifiers')
+
 
+filter = six.moves.filter
+map = six.moves.map
 
 if (3, 0) < sys.version_info < (3, 3):
     msg = (
@@ -555,7 +536,7 @@ run_main = run_script
 
 def get_distribution(dist):
     """Return a current distribution object for a Requirement or string"""
-    if isinstance(dist, string_types):
+    if isinstance(dist, six.string_types):
         dist = Requirement.parse(dist)
     if isinstance(dist, Requirement):
         dist = get_provider(dist)
@@ -2303,7 +2284,7 @@ def _set_parent_ns(packageName):
 
 def yield_lines(strs):
     """Yield non-empty/non-comment lines of a string or sequence"""
-    if isinstance(strs, string_types):
+    if isinstance(strs, six.string_types):
         for s in strs.splitlines():
             s = s.strip()
             # skip blank lines/comments
@@ -2470,9 +2451,9 @@ class EntryPoint(object):
 def _remove_md5_fragment(location):
     if not location:
         return ''
-    parsed = urlparse(location)
+    parsed = urllib.parse.urlparse(location)
     if parsed[-1].startswith('md5='):
-        return urlunparse(parsed[:-1] + ('',))
+        return urllib.parse.urlunparse(parsed[:-1] + ('',))
     return location
 
 
diff --git a/pkg_resources/_vendor/six.py b/pkg_resources/_vendor/six.py
new file mode 100644
index 00000000..190c0239
--- /dev/null
+++ b/pkg_resources/_vendor/six.py
@@ -0,0 +1,868 @@
+"""Utilities for writing code that runs on Python 2 and 3"""
+
+# Copyright (c) 2010-2015 Benjamin Peterson
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in all
+# copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+
+from __future__ import absolute_import
+
+import functools
+import itertools
+import operator
+import sys
+import types
+
+__author__ = "Benjamin Peterson <benjamin@python.org>"
+__version__ = "1.10.0"
+
+
+# Useful for very coarse version differentiation.
+PY2 = sys.version_info[0] == 2
+PY3 = sys.version_info[0] == 3
+PY34 = sys.version_info[0:2] >= (3, 4)
+
+if PY3:
+    string_types = str,
+    integer_types = int,
+    class_types = type,
+    text_type = str
+    binary_type = bytes
+
+    MAXSIZE = sys.maxsize
+else:
+    string_types = basestring,
+    integer_types = (int, long)
+    class_types = (type, types.ClassType)
+    text_type = unicode
+    binary_type = str
+
+    if sys.platform.startswith("java"):
+        # Jython always uses 32 bits.
+        MAXSIZE = int((1 << 31) - 1)
+    else:
+        # It's possible to have sizeof(long) != sizeof(Py_ssize_t).
+        class X(object):
+
+            def __len__(self):
+                return 1 << 31
+        try:
+            len(X())
+        except OverflowError:
+            # 32-bit
+            MAXSIZE = int((1 << 31) - 1)
+        else:
+            # 64-bit
+            MAXSIZE = int((1 << 63) - 1)
+        del X
+
+
+def _add_doc(func, doc):
+    """Add documentation to a function."""
+    func.__doc__ = doc
+
+
+def _import_module(name):
+    """Import module, returning the module after the last dot."""
+    __import__(name)
+    return sys.modules[name]
+
+
+class _LazyDescr(object):
+
+    def __init__(self, name):
+        self.name = name
+
+    def __get__(self, obj, tp):
+        result = self._resolve()
+        setattr(obj, self.name, result)  # Invokes __set__.
+        try:
+            # This is a bit ugly, but it avoids running this again by
+            # removing this descriptor.
+            delattr(obj.__class__, self.name)
+        except AttributeError:
+            pass
+        return result
+
+
+class MovedModule(_LazyDescr):
+
+    def __init__(self, name, old, new=None):
+        super(MovedModule, self).__init__(name)
+        if PY3:
+            if new is None:
+                new = name
+            self.mod = new
+        else:
+            self.mod = old
+
+    def _resolve(self):
+        return _import_module(self.mod)
+
+    def __getattr__(self, attr):
+        _module = self._resolve()
+        value = getattr(_module, attr)
+        setattr(self, attr, value)
+        return value
+
+
+class _LazyModule(types.ModuleType):
+
+    def __init__(self, name):
+        super(_LazyModule, self).__init__(name)
+        self.__doc__ = self.__class__.__doc__
+
+    def __dir__(self):
+        attrs = ["__doc__", "__name__"]
+        attrs += [attr.name for attr in self._moved_attributes]
+        return attrs
+
+    # Subclasses should override this
+    _moved_attributes = []
+
+
+class MovedAttribute(_LazyDescr):
+
+    def __init__(self, name, old_mod, new_mod, old_attr=None, new_attr=None):
+        super(MovedAttribute, self).__init__(name)
+        if PY3:
+            if new_mod is None:
+                new_mod = name
+            self.mod = new_mod
+            if new_attr is None:
+                if old_attr is None:
+                    new_attr = name
+                else:
+                    new_attr = old_attr
+            self.attr = new_attr
+        else:
+            self.mod = old_mod
+            if old_attr is None:
+                old_attr = name
+            self.attr = old_attr
+
+    def _resolve(self):
+        module = _import_module(self.mod)
+        return getattr(module, self.attr)
+
+
+class _SixMetaPathImporter(object):
+
+    """
+    A meta path importer to import six.moves and its submodules.
+
+    This class implements a PEP302 finder and loader. It should be compatible
+    with Python 2.5 and all existing versions of Python3
+    """
+
+    def __init__(self, six_module_name):
+        self.name = six_module_name
+        self.known_modules = {}
+
+    def _add_module(self, mod, *fullnames):
+        for fullname in fullnames:
+            self.known_modules[self.name + "." + fullname] = mod
+
+    def _get_module(self, fullname):
+        return self.known_modules[self.name + "." + fullname]
+
+    def find_module(self, fullname, path=None):
+        if fullname in self.known_modules:
+            return self
+        return None
+
+    def __get_module(self, fullname):
+        try:
+            return self.known_modules[fullname]
+        except KeyError:
+            raise ImportError("This loader does not know module " + fullname)
+
+    def load_module(self, fullname):
+        try:
+            # in case of a reload
+            return sys.modules[fullname]
+        except KeyError:
+            pass
+        mod = self.__get_module(fullname)
+        if isinstance(mod, MovedModule):
+            mod = mod._resolve()
+        else:
+            mod.__loader__ = self
+        sys.modules[fullname] = mod
+        return mod
+
+    def is_package(self, fullname):
+        """
+        Return true, if the named module is a package.
+
+        We need this method to get correct spec objects with
+        Python 3.4 (see PEP451)
+        """
+        return hasattr(self.__get_module(fullname), "__path__")
+
+    def get_code(self, fullname):
+        """Return None
+
+        Required, if is_package is implemented"""
+        self.__get_module(fullname)  # eventually raises ImportError
+        return None
+    get_source = get_code  # same as get_code
+
+_importer = _SixMetaPathImporter(__name__)
+
+
+class _MovedItems(_LazyModule):
+
+    """Lazy loading of moved objects"""
+    __path__ = []  # mark as package
+
+
+_moved_attributes = [
+    MovedAttribute("cStringIO", "cStringIO", "io", "StringIO"),
+    MovedAttribute("filter", "itertools", "builtins", "ifilter", "filter"),
+    MovedAttribute("filterfalse", "itertools", "itertools", "ifilterfalse", "filterfalse"),
+    MovedAttribute("input", "__builtin__", "builtins", "raw_input", "input"),
+    MovedAttribute("intern", "__builtin__", "sys"),
+    MovedAttribute("map", "itertools", "builtins", "imap", "map"),
+    MovedAttribute("getcwd", "os", "os", "getcwdu", "getcwd"),
+    MovedAttribute("getcwdb", "os", "os", "getcwd", "getcwdb"),
+    MovedAttribute("range", "__builtin__", "builtins", "xrange", "range"),
+    MovedAttribute("reload_module", "__builtin__", "importlib" if PY34 else "imp", "reload"),
+    MovedAttribute("reduce", "__builtin__", "functools"),
+    MovedAttribute("shlex_quote", "pipes", "shlex", "quote"),
+    MovedAttribute("StringIO", "StringIO", "io"),
+    MovedAttribute("UserDict", "UserDict", "collections"),
+    MovedAttribute("UserList", "UserList", "collections"),
+    MovedAttribute("UserString", "UserString", "collections"),
+    MovedAttribute("xrange", "__builtin__", "builtins", "xrange", "range"),
+    MovedAttribute("zip", "itertools", "builtins", "izip", "zip"),
+    MovedAttribute("zip_longest", "itertools", "itertools", "izip_longest", "zip_longest"),
+    MovedModule("builtins", "__builtin__"),
+    MovedModule("configparser", "ConfigParser"),
+    MovedModule("copyreg", "copy_reg"),
+    MovedModule("dbm_gnu", "gdbm", "dbm.gnu"),
+    MovedModule("_dummy_thread", "dummy_thread", "_dummy_thread"),
+    MovedModule("http_cookiejar", "cookielib", "http.cookiejar"),
+    MovedModule("http_cookies", "Cookie", "http.cookies"),
+    MovedModule("html_entities", "htmlentitydefs", "html.entities"),
+    MovedModule("html_parser", "HTMLParser", "html.parser"),
+    MovedModule("http_client", "httplib", "http.client"),
+    MovedModule("email_mime_multipart", "email.MIMEMultipart", "email.mime.multipart"),
+    MovedModule("email_mime_nonmultipart", "email.MIMENonMultipart", "email.mime.nonmultipart"),
+    MovedModule("email_mime_text", "email.MIMEText", "email.mime.text"),
+    MovedModule("email_mime_base", "email.MIMEBase", "email.mime.base"),
+    MovedModule("BaseHTTPServer", "BaseHTTPServer", "http.server"),
+    MovedModule("CGIHTTPServer", "CGIHTTPServer", "http.server"),
+    MovedModule("SimpleHTTPServer", "SimpleHTTPServer", "http.server"),
+    MovedModule("cPickle", "cPickle", "pickle"),
+    MovedModule("queue", "Queue"),
+    MovedModule("reprlib", "repr"),
+    MovedModule("socketserver", "SocketServer"),
+    MovedModule("_thread", "thread", "_thread"),
+    MovedModule("tkinter", "Tkinter"),
+    MovedModule("tkinter_dialog", "Dialog", "tkinter.dialog"),
+    MovedModule("tkinter_filedialog", "FileDialog", "tkinter.filedialog"),
+    MovedModule("tkinter_scrolledtext", "ScrolledText", "tkinter.scrolledtext"),
+    MovedModule("tkinter_simpledialog", "SimpleDialog", "tkinter.simpledialog"),
+    MovedModule("tkinter_tix", "Tix", "tkinter.tix"),
+    MovedModule("tkinter_ttk", "ttk", "tkinter.ttk"),
+    MovedModule("tkinter_constants", "Tkconstants", "tkinter.constants"),
+    MovedModule("tkinter_dnd", "Tkdnd", "tkinter.dnd"),
+    MovedModule("tkinter_colorchooser", "tkColorChooser",
+                "tkinter.colorchooser"),
+    MovedModule("tkinter_commondialog", "tkCommonDialog",
+                "tkinter.commondialog"),
+    MovedModule("tkinter_tkfiledialog", "tkFileDialog", "tkinter.filedialog"),
+    MovedModule("tkinter_font", "tkFont", "tkinter.font"),
+    MovedModule("tkinter_messagebox", "tkMessageBox", "tkinter.messagebox"),
+    MovedModule("tkinter_tksimpledialog", "tkSimpleDialog",
+                "tkinter.simpledialog"),
+    MovedModule("urllib_parse", __name__ + ".moves.urllib_parse", "urllib.parse"),
+    MovedModule("urllib_error", __name__ + ".moves.urllib_error", "urllib.error"),
+    MovedModule("urllib", __name__ + ".moves.urllib", __name__ + ".moves.urllib"),
+    MovedModule("urllib_robotparser", "robotparser", "urllib.robotparser"),
+    MovedModule("xmlrpc_client", "xmlrpclib", "xmlrpc.client"),
+    MovedModule("xmlrpc_server", "SimpleXMLRPCServer", "xmlrpc.server"),
+]
+# Add windows specific modules.
+if sys.platform == "win32":
+    _moved_attributes += [
+        MovedModule("winreg", "_winreg"),
+    ]
+
+for attr in _moved_attributes:
+    setattr(_MovedItems, attr.name, attr)
+    if isinstance(attr, MovedModule):
+        _importer._add_module(attr, "moves." + attr.name)
+del attr
+
+_MovedItems._moved_attributes = _moved_attributes
+
+moves = _MovedItems(__name__ + ".moves")
+_importer._add_module(moves, "moves")
+
+
+class Module_six_moves_urllib_parse(_LazyModule):
+
+    """Lazy loading of moved objects in six.moves.urllib_parse"""
+
+
+_urllib_parse_moved_attributes = [
+    MovedAttribute("ParseResult", "urlparse", "urllib.parse"),
+    MovedAttribute("SplitResult", "urlparse", "urllib.parse"),
+    MovedAttribute("parse_qs", "urlparse", "urllib.parse"),
+    MovedAttribute("parse_qsl", "urlparse", "urllib.parse"),
+    MovedAttribute("urldefrag", "urlparse", "urllib.parse"),
+    MovedAttribute("urljoin", "urlparse", "urllib.parse"),
+    MovedAttribute("urlparse", "urlparse", "urllib.parse"),
+    MovedAttribute("urlsplit", "urlparse", "urllib.parse"),
+    MovedAttribute("urlunparse", "urlparse", "urllib.parse"),
+    MovedAttribute("urlunsplit", "urlparse", "urllib.parse"),
+    MovedAttribute("quote", "urllib", "urllib.parse"),
+    MovedAttribute("quote_plus", "urllib", "urllib.parse"),
+    MovedAttribute("unquote", "urllib", "urllib.parse"),
+    MovedAttribute("unquote_plus", "urllib", "urllib.parse"),
+    MovedAttribute("urlencode", "urllib", "urllib.parse"),
+    MovedAttribute("splitquery", "urllib", "urllib.parse"),
+    MovedAttribute("splittag", "urllib", "urllib.parse"),
+    MovedAttribute("splituser", "urllib", "urllib.parse"),
+    MovedAttribute("uses_fragment", "urlparse", "urllib.parse"),
+    MovedAttribute("uses_netloc", "urlparse", "urllib.parse"),
+    MovedAttribute("uses_params", "urlparse", "urllib.parse"),
+    MovedAttribute("uses_query", "urlparse", "urllib.parse"),
+    MovedAttribute("uses_relative", "urlparse", "urllib.parse"),
+]
+for attr in _urllib_parse_moved_attributes:
+    setattr(Module_six_moves_urllib_parse, attr.name, attr)
+del attr
+
+Module_six_moves_urllib_parse._moved_attributes = _urllib_parse_moved_attributes
+
+_importer._add_module(Module_six_moves_urllib_parse(__name__ + ".moves.urllib_parse"),
+                      "moves.urllib_parse", "moves.urllib.parse")
+
+
+class Module_six_moves_urllib_error(_LazyModule):
+
+    """Lazy loading of moved objects in six.moves.urllib_error"""
+
+
+_urllib_error_moved_attributes = [
+    MovedAttribute("URLError", "urllib2", "urllib.error"),
+    MovedAttribute("HTTPError", "urllib2", "urllib.error"),
+    MovedAttribute("ContentTooShortError", "urllib", "urllib.error"),
+]
+for attr in _urllib_error_moved_attributes:
+    setattr(Module_six_moves_urllib_error, attr.name, attr)
+del attr
+
+Module_six_moves_urllib_error._moved_attributes = _urllib_error_moved_attributes
+
+_importer._add_module(Module_six_moves_urllib_error(__name__ + ".moves.urllib.error"),
+                      "moves.urllib_error", "moves.urllib.error")
+
+
+class Module_six_moves_urllib_request(_LazyModule):
+
+    """Lazy loading of moved objects in six.moves.urllib_request"""
+
+
+_urllib_request_moved_attributes = [
+    MovedAttribute("urlopen", "urllib2", "urllib.request"),
+    MovedAttribute("install_opener", "urllib2", "urllib.request"),
+    MovedAttribute("build_opener", "urllib2", "urllib.request"),
+    MovedAttribute("pathname2url", "urllib", "urllib.request"),
+    MovedAttribute("url2pathname", "urllib", "urllib.request"),
+    MovedAttribute("getproxies", "urllib", "urllib.request"),
+    MovedAttribute("Request", "urllib2", "urllib.request"),
+    MovedAttribute("OpenerDirector", "urllib2", "urllib.request"),
+    MovedAttribute("HTTPDefaultErrorHandler", "urllib2", "urllib.request"),
+    MovedAttribute("HTTPRedirectHandler", "urllib2", "urllib.request"),
+    MovedAttribute("HTTPCookieProcessor", "urllib2", "urllib.request"),
+    MovedAttribute("ProxyHandler", "urllib2", "urllib.request"),
+    MovedAttribute("BaseHandler", "urllib2", "urllib.request"),
+    MovedAttribute("HTTPPasswordMgr", "urllib2", "urllib.request"),
+    MovedAttribute("HTTPPasswordMgrWithDefaultRealm", "urllib2", "urllib.request"),
+    MovedAttribute("AbstractBasicAuthHandler", "urllib2", "urllib.request"),
+    MovedAttribute("HTTPBasicAuthHandler", "urllib2", "urllib.request"),
+    MovedAttribute("ProxyBasicAuthHandler", "urllib2", "urllib.request"),
+    MovedAttribute("AbstractDigestAuthHandler", "urllib2", "urllib.request"),
+    MovedAttribute("HTTPDigestAuthHandler", "urllib2", "urllib.request"),
+    MovedAttribute("ProxyDigestAuthHandler", "urllib2", "urllib.request"),
+    MovedAttribute("HTTPHandler", "urllib2", "urllib.request"),
+    MovedAttribute("HTTPSHandler", "urllib2", "urllib.request"),
+    MovedAttribute("FileHandler", "urllib2", "urllib.request"),
+    MovedAttribute("FTPHandler", "urllib2", "urllib.request"),
+    MovedAttribute("CacheFTPHandler", "urllib2", "urllib.request"),
+    MovedAttribute("UnknownHandler", "urllib2", "urllib.request"),
+    MovedAttribute("HTTPErrorProcessor", "urllib2", "urllib.request"),
+    MovedAttribute("urlretrieve", "urllib", "urllib.request"),
+    MovedAttribute("urlcleanup", "urllib", "urllib.request"),
+    MovedAttribute("URLopener", "urllib", "urllib.request"),
+    MovedAttribute("FancyURLopener", "urllib", "urllib.request"),
+    MovedAttribute("proxy_bypass", "urllib", "urllib.request"),
+]
+for attr in _urllib_request_moved_attributes:
+    setattr(Module_six_moves_urllib_request, attr.name, attr)
+del attr
+
+Module_six_moves_urllib_request._moved_attributes = _urllib_request_moved_attributes
+
+_importer._add_module(Module_six_moves_urllib_request(__name__ + ".moves.urllib.request"),
+                      "moves.urllib_request", "moves.urllib.request")
+
+
+class Module_six_moves_urllib_response(_LazyModule):
+
+    """Lazy loading of moved objects in six.moves.urllib_response"""
+
+
+_urllib_response_moved_attributes = [
+    MovedAttribute("addbase", "urllib", "urllib.response"),
+    MovedAttribute("addclosehook", "urllib", "urllib.response"),
+    MovedAttribute("addinfo", "urllib", "urllib.response"),
+    MovedAttribute("addinfourl", "urllib", "urllib.response"),
+]
+for attr in _urllib_response_moved_attributes:
+    setattr(Module_six_moves_urllib_response, attr.name, attr)
+del attr
+
+Module_six_moves_urllib_response._moved_attributes = _urllib_response_moved_attributes
+
+_importer._add_module(Module_six_moves_urllib_response(__name__ + ".moves.urllib.response"),
+                      "moves.urllib_response", "moves.urllib.response")
+
+
+class Module_six_moves_urllib_robotparser(_LazyModule):
+
+    """Lazy loading of moved objects in six.moves.urllib_robotparser"""
+
+
+_urllib_robotparser_moved_attributes = [
+    MovedAttribute("RobotFileParser", "robotparser", "urllib.robotparser"),
+]
+for attr in _urllib_robotparser_moved_attributes:
+    setattr(Module_six_moves_urllib_robotparser, attr.name, attr)
+del attr
+
+Module_six_moves_urllib_robotparser._moved_attributes = _urllib_robotparser_moved_attributes
+
+_importer._add_module(Module_six_moves_urllib_robotparser(__name__ + ".moves.urllib.robotparser"),
+                      "moves.urllib_robotparser", "moves.urllib.robotparser")
+
+
+class Module_six_moves_urllib(types.ModuleType):
+
+    """Create a six.moves.urllib namespace that resembles the Python 3 namespace"""
+    __path__ = []  # mark as package
+    parse = _importer._get_module("moves.urllib_parse")
+    error = _importer._get_module("moves.urllib_error")
+    request = _importer._get_module("moves.urllib_request")
+    response = _importer._get_module("moves.urllib_response")
+    robotparser = _importer._get_module("moves.urllib_robotparser")
+
+    def __dir__(self):
+        return ['parse', 'error', 'request', 'response', 'robotparser']
+
+_importer._add_module(Module_six_moves_urllib(__name__ + ".moves.urllib"),
+                      "moves.urllib")
+
+
+def add_move(move):
+    """Add an item to six.moves."""
+    setattr(_MovedItems, move.name, move)
+
+
+def remove_move(name):
+    """Remove item from six.moves."""
+    try:
+        delattr(_MovedItems, name)
+    except AttributeError:
+        try:
+            del moves.__dict__[name]
+        except KeyError:
+            raise AttributeError("no such move, %r" % (name,))
+
+
+if PY3:
+    _meth_func = "__func__"
+    _meth_self = "__self__"
+
+    _func_closure = "__closure__"
+    _func_code = "__code__"
+    _func_defaults = "__defaults__"
+    _func_globals = "__globals__"
+else:
+    _meth_func = "im_func"
+    _meth_self = "im_self"
+
+    _func_closure = "func_closure"
+    _func_code = "func_code"
+    _func_defaults = "func_defaults"
+    _func_globals = "func_globals"
+
+
+try:
+    advance_iterator = next
+except NameError:
+    def advance_iterator(it):
+        return it.next()
+next = advance_iterator
+
+
+try:
+    callable = callable
+except NameError:
+    def callable(obj):
+        return any("__call__" in klass.__dict__ for klass in type(obj).__mro__)
+
+
+if PY3:
+    def get_unbound_function(unbound):
+        return unbound
+
+    create_bound_method = types.MethodType
+
+    def create_unbound_method(func, cls):
+        return func
+
+    Iterator = object
+else:
+    def get_unbound_function(unbound):
+        return unbound.im_func
+
+    def create_bound_method(func, obj):
+        return types.MethodType(func, obj, obj.__class__)
+
+    def create_unbound_method(func, cls):
+        return types.MethodType(func, None, cls)
+
+    class Iterator(object):
+
+        def next(self):
+            return type(self).__next__(self)
+
+    callable = callable
+_add_doc(get_unbound_function,
+         """Get the function out of a possibly unbound function""")
+
+
+get_method_function = operator.attrgetter(_meth_func)
+get_method_self = operator.attrgetter(_meth_self)
+get_function_closure = operator.attrgetter(_func_closure)
+get_function_code = operator.attrgetter(_func_code)
+get_function_defaults = operator.attrgetter(_func_defaults)
+get_function_globals = operator.attrgetter(_func_globals)
+
+
+if PY3:
+    def iterkeys(d, **kw):
+        return iter(d.keys(**kw))
+
+    def itervalues(d, **kw):
+        return iter(d.values(**kw))
+
+    def iteritems(d, **kw):
+        return iter(d.items(**kw))
+
+    def iterlists(d, **kw):
+        return iter(d.lists(**kw))
+
+    viewkeys = operator.methodcaller("keys")
+
+    viewvalues = operator.methodcaller("values")
+
+    viewitems = operator.methodcaller("items")
+else:
+    def iterkeys(d, **kw):
+        return d.iterkeys(**kw)
+
+    def itervalues(d, **kw):
+        return d.itervalues(**kw)
+
+    def iteritems(d, **kw):
+        return d.iteritems(**kw)
+
+    def iterlists(d, **kw):
+        return d.iterlists(**kw)
+
+    viewkeys = operator.methodcaller("viewkeys")
+
+    viewvalues = operator.methodcaller("viewvalues")
+
+    viewitems = operator.methodcaller("viewitems")
+
+_add_doc(iterkeys, "Return an iterator over the keys of a dictionary.")
+_add_doc(itervalues, "Return an iterator over the values of a dictionary.")
+_add_doc(iteritems,
+         "Return an iterator over the (key, value) pairs of a dictionary.")
+_add_doc(iterlists,
+         "Return an iterator over the (key, [values]) pairs of a dictionary.")
+
+
+if PY3:
+    def b(s):
+        return s.encode("latin-1")
+
+    def u(s):
+        return s
+    unichr = chr
+    import struct
+    int2byte = struct.Struct(">B").pack
+    del struct
+    byte2int = operator.itemgetter(0)
+    indexbytes = operator.getitem
+    iterbytes = iter
+    import io
+    StringIO = io.StringIO
+    BytesIO = io.BytesIO
+    _assertCountEqual = "assertCountEqual"
+    if sys.version_info[1] <= 1:
+        _assertRaisesRegex = "assertRaisesRegexp"
+        _assertRegex = "assertRegexpMatches"
+    else:
+        _assertRaisesRegex = "assertRaisesRegex"
+        _assertRegex = "assertRegex"
+else:
+    def b(s):
+        return s
+    # Workaround for standalone backslash
+
+    def u(s):
+        return unicode(s.replace(r'\\', r'\\\\'), "unicode_escape")
+    unichr = unichr
+    int2byte = chr
+
+    def byte2int(bs):
+        return ord(bs[0])
+
+    def indexbytes(buf, i):
+        return ord(buf[i])
+    iterbytes = functools.partial(itertools.imap, ord)
+    import StringIO
+    StringIO = BytesIO = StringIO.StringIO
+    _assertCountEqual = "assertItemsEqual"
+    _assertRaisesRegex = "assertRaisesRegexp"
+    _assertRegex = "assertRegexpMatches"
+_add_doc(b, """Byte literal""")
+_add_doc(u, """Text literal""")
+
+
+def assertCountEqual(self, *args, **kwargs):
+    return getattr(self, _assertCountEqual)(*args, **kwargs)
+
+
+def assertRaisesRegex(self, *args, **kwargs):
+    return getattr(self, _assertRaisesRegex)(*args, **kwargs)
+
+
+def assertRegex(self, *args, **kwargs):
+    return getattr(self, _assertRegex)(*args, **kwargs)
+
+
+if PY3:
+    exec_ = getattr(moves.builtins, "exec")
+
+    def reraise(tp, value, tb=None):
+        if value is None:
+            value = tp()
+        if value.__traceback__ is not tb:
+            raise value.with_traceback(tb)
+        raise value
+
+else:
+    def exec_(_code_, _globs_=None, _locs_=None):
+        """Execute code in a namespace."""
+        if _globs_ is None:
+            frame = sys._getframe(1)
+            _globs_ = frame.f_globals
+            if _locs_ is None:
+                _locs_ = frame.f_locals
+            del frame
+        elif _locs_ is None:
+            _locs_ = _globs_
+        exec("""exec _code_ in _globs_, _locs_""")
+
+    exec_("""def reraise(tp, value, tb=None):
+    raise tp, value, tb
+""")
+
+
+if sys.version_info[:2] == (3, 2):
+    exec_("""def raise_from(value, from_value):
+    if from_value is None:
+        raise value
+    raise value from from_value
+""")
+elif sys.version_info[:2] > (3, 2):
+    exec_("""def raise_from(value, from_value):
+    raise value from from_value
+""")
+else:
+    def raise_from(value, from_value):
+        raise value
+
+
+print_ = getattr(moves.builtins, "print", None)
+if print_ is None:
+    def print_(*args, **kwargs):
+        """The new-style print function for Python 2.4 and 2.5."""
+        fp = kwargs.pop("file", sys.stdout)
+        if fp is None:
+            return
+
+        def write(data):
+            if not isinstance(data, basestring):
+                data = str(data)
+            # If the file has an encoding, encode unicode with it.
+            if (isinstance(fp, file) and
+                    isinstance(data, unicode) and
+                    fp.encoding is not None):
+                errors = getattr(fp, "errors", None)
+                if errors is None:
+                    errors = "strict"
+                data = data.encode(fp.encoding, errors)
+            fp.write(data)
+        want_unicode = False
+        sep = kwargs.pop("sep", None)
+        if sep is not None:
+            if isinstance(sep, unicode):
+                want_unicode = True
+            elif not isinstance(sep, str):
+                raise TypeError("sep must be None or a string")
+        end = kwargs.pop("end", None)
+        if end is not None:
+            if isinstance(end, unicode):
+                want_unicode = True
+            elif not isinstance(end, str):
+                raise TypeError("end must be None or a string")
+        if kwargs:
+            raise TypeError("invalid keyword arguments to print()")
+        if not want_unicode:
+            for arg in args:
+                if isinstance(arg, unicode):
+                    want_unicode = True
+                    break
+        if want_unicode:
+            newline = unicode("\n")
+            space = unicode(" ")
+        else:
+            newline = "\n"
+            space = " "
+        if sep is None:
+            sep = space
+        if end is None:
+            end = newline
+        for i, arg in enumerate(args):
+            if i:
+                write(sep)
+            write(arg)
+        write(end)
+if sys.version_info[:2] < (3, 3):
+    _print = print_
+
+    def print_(*args, **kwargs):
+        fp = kwargs.get("file", sys.stdout)
+        flush = kwargs.pop("flush", False)
+        _print(*args, **kwargs)
+        if flush and fp is not None:
+            fp.flush()
+
+_add_doc(reraise, """Reraise an exception.""")
+
+if sys.version_info[0:2] < (3, 4):
+    def wraps(wrapped, assigned=functools.WRAPPER_ASSIGNMENTS,
+              updated=functools.WRAPPER_UPDATES):
+        def wrapper(f):
+            f = functools.wraps(wrapped, assigned, updated)(f)
+            f.__wrapped__ = wrapped
+            return f
+        return wrapper
+else:
+    wraps = functools.wraps
+
+
+def with_metaclass(meta, *bases):
+    """Create a base class with a metaclass."""
+    # This requires a bit of explanation: the basic idea is to make a dummy
+    # metaclass for one level of class instantiation that replaces itself with
+    # the actual metaclass.
+    class metaclass(meta):
+
+        def __new__(cls, name, this_bases, d):
+            return meta(name, bases, d)
+    return type.__new__(metaclass, 'temporary_class', (), {})
+
+
+def add_metaclass(metaclass):
+    """Class decorator for creating a class with a metaclass."""
+    def wrapper(cls):
+        orig_vars = cls.__dict__.copy()
+        slots = orig_vars.get('__slots__')
+        if slots is not None:
+            if isinstance(slots, str):
+                slots = [slots]
+            for slots_var in slots:
+                orig_vars.pop(slots_var)
+        orig_vars.pop('__dict__', None)
+        orig_vars.pop('__weakref__', None)
+        return metaclass(cls.__name__, cls.__bases__, orig_vars)
+    return wrapper
+
+
+def python_2_unicode_compatible(klass):
+    """
+    A decorator that defines __unicode__ and __str__ methods under Python 2.
+    Under Python 3 it does nothing.
+
+    To support Python 2 and 3 with a single code base, define a __str__ method
+    returning text and apply this decorator to the class.
+    """
+    if PY2:
+        if '__str__' not in klass.__dict__:
+            raise ValueError("@python_2_unicode_compatible cannot be applied "
+                             "to %s because it doesn't define __str__()." %
+                             klass.__name__)
+        klass.__unicode__ = klass.__str__
+        klass.__str__ = lambda self: self.__unicode__().encode('utf-8')
+    return klass
+
+
+# Complete the moves implementation.
+# This code is at the end of this module to speed up module loading.
+# Turn this module into a package.
+__path__ = []  # required for PEP 302 and PEP 451
+__package__ = __name__  # see PEP 366 @ReservedAssignment
+if globals().get("__spec__") is not None:
+    __spec__.submodule_search_locations = []  # PEP 451 @UndefinedVariable
+# Remove other six meta path importers, since they cause problems. This can
+# happen if six is removed from sys.modules and then reloaded. (Setuptools does
+# this for some reason.)
+if sys.meta_path:
+    for i, importer in enumerate(sys.meta_path):
+        # Here's some real nastiness: Another "instance" of the six module might
+        # be floating around. Therefore, we can't use isinstance() to check for
+        # the six meta path importer, since the other six instance will have
+        # inserted an importer with different class.
+        if (type(importer).__name__ == "_SixMetaPathImporter" and
+                importer.name == __name__):
+            del sys.meta_path[i]
+            break
+    del i, importer
+# Finally, add the importer to the meta path import hook.
+sys.meta_path.append(_importer)
diff --git a/pkg_resources/_vendor/vendored.txt b/pkg_resources/_vendor/vendored.txt
index 4cf7664e..eec98267 100644
--- a/pkg_resources/_vendor/vendored.txt
+++ b/pkg_resources/_vendor/vendored.txt
@@ -1 +1,2 @@
 packaging==15.3
+six==1.10.0
diff --git a/pkg_resources/extern/__init__.py b/pkg_resources/extern/__init__.py
new file mode 100644
index 00000000..317f4b8d
--- /dev/null
+++ b/pkg_resources/extern/__init__.py
@@ -0,0 +1,71 @@
+import sys
+
+
+class VendorImporter:
+    """
+    A PEP 302 meta path importer for finding optionally-vendored
+    or otherwise naturally-installed packages from root_name.
+    """
+    def __init__(self, root_name, vendored_names=(), vendor_pkg=None):
+        self.root_name = root_name
+        self.vendored_names = set(vendored_names)
+        self.vendor_pkg = vendor_pkg or root_name.replace('extern', '_vendor')
+
+    @property
+    def search_path(self):
+        """
+        Search first the vendor package then as a natural package.
+        """
+        yield self.vendor_pkg + '.'
+        yield ''
+
+    def find_module(self, fullname, path=None):
+        """
+        Return self when fullname starts with root_name and the
+        target module is one vendored through this importer.
+        """
+        root, base, target = fullname.partition(self.root_name + '.')
+        if root:
+            return
+        if not any(map(target.startswith, self.vendored_names)):
+            return
+        return self
+
+    def load_module(self, fullname):
+        """
+        Iterate over the search path to locate and load fullname.
+        """
+        root, base, target = fullname.partition(self.root_name + '.')
+        for prefix in self.search_path:
+            try:
+                extant = prefix + target
+                __import__(extant)
+                mod = sys.modules[extant]
+                sys.modules[fullname] = mod
+                # mysterious hack:
+                # Remove the reference to the extant package/module
+                # on later Python versions to cause relative imports
+                # in the vendor package to resolve the same modules
+                # as those going through this importer.
+                if sys.version_info > (3, 3):
+                    del sys.modules[extant]
+                return mod
+            except ImportError:
+                pass
+        else:
+            raise ImportError(
+                "The '{target}' package is required; "
+                "normally this is bundled with this package so if you get "
+                "this warning, consult the packager of your "
+                "distribution.".format(**locals())
+            )
+
+    def install(self):
+        """
+        Install this importer into sys.meta_path if not already present.
+        """
+        if self not in sys.meta_path:
+            sys.meta_path.append(self)
+
+names = 'packaging', 'six'
+VendorImporter(__name__, names).install()
diff --git a/pkg_resources/tests/test_resources.py b/pkg_resources/tests/test_resources.py
index a55478a2..4241765a 100644
--- a/pkg_resources/tests/test_resources.py
+++ b/pkg_resources/tests/test_resources.py
@@ -5,14 +5,13 @@ import shutil
 import string
 
 import pytest
+from pkg_resources.extern import packaging
 
 import pkg_resources
 from pkg_resources import (parse_requirements, VersionConflict, parse_version,
     Distribution, EntryPoint, Requirement, safe_version, safe_name,
     WorkingSet)
 
-packaging = pkg_resources.packaging
-
 
 def safe_repr(obj, short=False):
     """ copied from Python2.7"""
@@ -245,9 +244,8 @@ class TestWorkingSet:
         with pytest.raises(VersionConflict) as vc:
             ws.resolve(parse_requirements("Foo\nBar\n"))
 
-        msg = "Baz 1.0 is installed but Baz==2.0 is required by {'Bar'}"
-        if pkg_resources.PY2:
-            msg = msg.replace("{'Bar'}", "set(['Bar'])")
+        msg = "Baz 1.0 is installed but Baz==2.0 is required by "
+        msg += repr(set(['Bar']))
         assert vc.value.report() == msg
 
 
@@ -313,7 +311,7 @@ class TestEntryPoints:
 
     def checkSubMap(self, m):
         assert len(m) == len(self.submap_expect)
-        for key, ep in pkg_resources.iteritems(self.submap_expect):
+        for key, ep in self.submap_expect.items():
             assert repr(m.get(key)) == repr(ep)
 
     submap_expect = dict(
diff --git a/pytest.ini b/pytest.ini
index 351942f4..ab4a6df3 100755
--- a/pytest.ini
+++ b/pytest.ini
@@ -1,3 +1,3 @@
 [pytest]
 addopts=--doctest-modules --ignore release.py --ignore setuptools/lib2to3_ex.py --ignore tests/manual_test.py --ignore tests/shlib_test --doctest-glob=pkg_resources/api_tests.txt --ignore scripts/upload-old-releases-as-zip.py
-norecursedirs=dist build *.egg
+norecursedirs=dist build *.egg setuptools/extern pkg_resources/extern
diff --git a/setuptools/__init__.py b/setuptools/__init__.py
index 712ec082..ec0d5dc2 100644
--- a/setuptools/__init__.py
+++ b/setuptools/__init__.py
@@ -8,11 +8,12 @@ from distutils.core import Command as _Command
 from distutils.util import convert_path
 from fnmatch import fnmatchcase
 
+from setuptools.extern.six.moves import filterfalse
+
 import setuptools.version
 from setuptools.extension import Extension
 from setuptools.dist import Distribution, Feature, _get_unpatched
 from setuptools.depends import Require
-from setuptools.compat import filterfalse
 
 __all__ = [
     'setup', 'Distribution', 'Feature', 'Command', 'Extension', 'Require',
diff --git a/setuptools/command/bdist_egg.py b/setuptools/command/bdist_egg.py
index 87dce882..9cebd7fa 100644
--- a/setuptools/command/bdist_egg.py
+++ b/setuptools/command/bdist_egg.py
@@ -11,9 +11,10 @@ import os
 import marshal
 import textwrap
 
+from setuptools.extern import six
+
 from pkg_resources import get_build_platform, Distribution, ensure_directory
 from pkg_resources import EntryPoint
-from setuptools.compat import basestring
 from setuptools.extension import Library
 from setuptools import Command
 
@@ -413,7 +414,7 @@ def iter_symbols(code):
     for name in code.co_names:
         yield name
     for const in code.co_consts:
-        if isinstance(const, basestring):
+        if isinstance(const, six.string_types):
             yield const
         elif isinstance(const, CodeType):
             for name in iter_symbols(const):
diff --git a/setuptools/command/develop.py b/setuptools/command/develop.py
index 07b66ccb..11b5df10 100755
--- a/setuptools/command/develop.py
+++ b/setuptools/command/develop.py
@@ -5,9 +5,10 @@ import os
 import glob
 import io
 
+from setuptools.extern import six
+
 from pkg_resources import Distribution, PathMetadata, normalize_path
 from setuptools.command.easy_install import easy_install
-from setuptools.compat import PY3
 import setuptools
 
 
@@ -87,7 +88,7 @@ class develop(easy_install):
                 " installation directory", p, normalize_path(os.curdir))
 
     def install_for_development(self):
-        if PY3 and getattr(self.distribution, 'use_2to3', False):
+        if six.PY3 and getattr(self.distribution, 'use_2to3', False):
             # If we run 2to3 we can not do this inplace:
 
             # Ensure metadata is up-to-date
diff --git a/setuptools/command/easy_install.py b/setuptools/command/easy_install.py
index 9ca3b515..a11618d1 100755
--- a/setuptools/command/easy_install.py
+++ b/setuptools/command/easy_install.py
@@ -40,6 +40,9 @@ import subprocess
 import shlex
 import io
 
+from setuptools.extern import six
+from setuptools.extern.six.moves import configparser
+
 from setuptools import Command
 from setuptools.sandbox import run_setup
 from setuptools.py31compat import get_path, get_config_vars
@@ -48,8 +51,6 @@ from setuptools.archive_util import unpack_archive
 from setuptools.package_index import PackageIndex
 from setuptools.package_index import URL_SCHEME
 from setuptools.command import bdist_egg, egg_info
-from setuptools.compat import (iteritems, maxsize, basestring, unicode,
-                               reraise, PY2, PY3)
 from pkg_resources import (
     yield_lines, normalize_path, resource_string, ensure_directory,
     get_distribution, find_distributions, Environment, Requirement,
@@ -82,13 +83,13 @@ def samefile(p1, p2):
     return norm_p1 == norm_p2
 
 
-if PY2:
+if six.PY2:
     def _to_ascii(s):
         return s
 
     def isascii(s):
         try:
-            unicode(s, 'ascii')
+            six.text_type(s, 'ascii')
             return True
         except UnicodeError:
             return False
@@ -320,7 +321,7 @@ class easy_install(Command):
         self.local_index = Environment(self.shadow_path + sys.path)
 
         if self.find_links is not None:
-            if isinstance(self.find_links, basestring):
+            if isinstance(self.find_links, six.string_types):
                 self.find_links = self.find_links.split()
         else:
             self.find_links = []
@@ -413,7 +414,7 @@ class easy_install(Command):
         try:
             pid = os.getpid()
         except:
-            pid = random.randint(0, maxsize)
+            pid = random.randint(0, sys.maxsize)
         return os.path.join(self.install_dir, "test-easy-install-%s" % pid)
 
     def warn_deprecated_options(self):
@@ -1245,7 +1246,7 @@ class easy_install(Command):
             f = open(sitepy, 'rb')
             current = f.read()
             # we want str, not bytes
-            if PY3:
+            if six.PY3:
                 current = current.decode()
 
             f.close()
@@ -1271,7 +1272,7 @@ class easy_install(Command):
         if not self.user:
             return
         home = convert_path(os.path.expanduser("~"))
-        for name, path in iteritems(self.config_vars):
+        for name, path in six.iteritems(self.config_vars):
             if path.startswith(home) and not os.path.isdir(path):
                 self.debug_print("os.makedirs('%s', 0o700)" % path)
                 os.makedirs(path, 0o700)
@@ -1415,9 +1416,6 @@ def extract_wininst_cfg(dist_filename):
             return None
         f.seek(prepended - 12)
 
-        from setuptools.compat import StringIO, configparser
-        import struct
-
         tag, cfglen, bmlen = struct.unpack("<iii", f.read(12))
         if tag not in (0x1234567A, 0x1234567B):
             return None  # not a valid tag
@@ -1432,7 +1430,7 @@ def extract_wininst_cfg(dist_filename):
             # Now the config is in bytes, but for RawConfigParser, it should
             #  be text, so decode it.
             config = config.decode(sys.getfilesystemencoding())
-            cfg.readfp(StringIO(config))
+            cfg.readfp(six.StringIO(config))
         except configparser.Error:
             return None
         if not cfg.has_section('metadata') or not cfg.has_section('Setup'):
@@ -1467,7 +1465,7 @@ def get_exe_prefixes(exe_filename):
                 continue
             if parts[0].upper() in ('PURELIB', 'PLATLIB'):
                 contents = z.read(name)
-                if PY3:
+                if six.PY3:
                     contents = contents.decode()
                 for pth in yield_lines(contents):
                     pth = pth.strip().replace('\\', '/')
@@ -1643,7 +1641,7 @@ def auto_chmod(func, arg, exc):
         chmod(arg, stat.S_IWRITE)
         return func(arg)
     et, ev, _ = sys.exc_info()
-    reraise(et, (ev[0], ev[1] + (" %s %s" % (func, arg))))
+    six.reraise(et, (ev[0], ev[1] + (" %s %s" % (func, arg))))
 
 
 def update_dist_caches(dist_path, fix_zipimporter_caches):
@@ -2209,7 +2207,7 @@ def get_win_launcher(type):
 
 def load_launcher_manifest(name):
     manifest = pkg_resources.resource_string(__name__, 'launcher manifest.xml')
-    if PY2:
+    if six.PY2:
         return manifest % vars()
     else:
         return manifest.decode('utf-8') % vars()
diff --git a/setuptools/command/egg_info.py b/setuptools/command/egg_info.py
index 1301bd84..18a3105f 100755
--- a/setuptools/command/egg_info.py
+++ b/setuptools/command/egg_info.py
@@ -14,7 +14,7 @@ import io
 import warnings
 import time
 
-from setuptools.compat import basestring, PY3, StringIO
+from setuptools.extern import six
 
 from setuptools import Command
 from setuptools.command.sdist import sdist
@@ -26,7 +26,7 @@ from pkg_resources import (
     safe_version, yield_lines, EntryPoint, iter_entry_points, to_filename)
 import setuptools.unicode_utils as unicode_utils
 
-from pkg_resources import packaging
+from pkg_resources.extern import packaging
 
 try:
     from setuptools_svn import svn_utils
@@ -148,7 +148,7 @@ class egg_info(Command):
         to the file.
         """
         log.info("writing %s to %s", what, filename)
-        if PY3:
+        if six.PY3:
             data = data.encode("utf-8")
         if not self.dry_run:
             f = open(filename, 'wb')
@@ -412,7 +412,7 @@ def _write_requirements(stream, reqs):
 
 def write_requirements(cmd, basename, filename):
     dist = cmd.distribution
-    data = StringIO()
+    data = six.StringIO()
     _write_requirements(data, dist.install_requires)
     extras_require = dist.extras_require or {}
     for extra in sorted(extras_require):
@@ -452,12 +452,12 @@ def write_arg(cmd, basename, filename, force=False):
 def write_entries(cmd, basename, filename):
     ep = cmd.distribution.entry_points
 
-    if isinstance(ep, basestring) or ep is None:
+    if isinstance(ep, six.string_types) or ep is None:
         data = ep
     elif ep is not None:
         data = []
         for section, contents in sorted(ep.items()):
-            if not isinstance(contents, basestring):
+            if not isinstance(contents, six.string_types):
                 contents = EntryPoint.parse_group(section, contents)
                 contents = '\n'.join(sorted(map(str, contents.values())))
             data.append('[%s]\n%s\n\n' % (section, contents))
diff --git a/setuptools/command/rotate.py b/setuptools/command/rotate.py
index 1b073620..804f962a 100755
--- a/setuptools/command/rotate.py
+++ b/setuptools/command/rotate.py
@@ -3,8 +3,9 @@ from distutils import log
 from distutils.errors import DistutilsOptionError
 import os
 
+from setuptools.extern import six
+
 from setuptools import Command
-from setuptools.compat import basestring
 
 
 class rotate(Command):
@@ -36,7 +37,7 @@ class rotate(Command):
             self.keep = int(self.keep)
         except ValueError:
             raise DistutilsOptionError("--keep must be an integer")
-        if isinstance(self.match, basestring):
+        if isinstance(self.match, six.string_types):
             self.match = [
                 convert_path(p.strip()) for p in self.match.split(',')
             ]
diff --git a/setuptools/command/sdist.py b/setuptools/command/sdist.py
index 71196512..6640d4e3 100755
--- a/setuptools/command/sdist.py
+++ b/setuptools/command/sdist.py
@@ -5,7 +5,8 @@ import os
 import sys
 import io
 
-from setuptools.compat import PY3
+from setuptools.extern import six
+
 from setuptools.utils import cs_path_exists
 
 import pkg_resources
@@ -181,7 +182,7 @@ class sdist(orig.sdist):
         manifest = open(self.manifest, 'rbU')
         for line in manifest:
             # The manifest must contain UTF-8. See #303.
-            if PY3:
+            if six.PY3:
                 try:
                     line = line.decode('UTF-8')
                 except UnicodeDecodeError:
diff --git a/setuptools/command/setopt.py b/setuptools/command/setopt.py
index 74c7cad8..7f332be5 100755
--- a/setuptools/command/setopt.py
+++ b/setuptools/command/setopt.py
@@ -4,6 +4,8 @@ from distutils.errors import DistutilsOptionError
 import distutils
 import os
 
+from setuptools.extern.six.moves import configparser
+
 from setuptools import Command
 
 
@@ -37,8 +39,6 @@ def edit_config(filename, settings, dry_run=False):
     while a dictionary lists settings to be changed or deleted in that section.
     A setting of ``None`` means to delete that setting.
     """
-    from setuptools.compat import configparser
-
     log.debug("Reading configuration from %s", filename)
     opts = configparser.RawConfigParser()
     opts.read([filename])
diff --git a/setuptools/command/test.py b/setuptools/command/test.py
index c26f5fc9..3a2a9b93 100644
--- a/setuptools/command/test.py
+++ b/setuptools/command/test.py
@@ -2,11 +2,12 @@ from distutils.errors import DistutilsOptionError
 from unittest import TestLoader
 import sys
 
+from setuptools.extern import six
+
 from pkg_resources import (resource_listdir, resource_exists, normalize_path,
                            working_set, _namespace_packages,
                            add_activation_listener, require, EntryPoint)
 from setuptools import Command
-from setuptools.compat import PY3
 from setuptools.py31compat import unittest_main
 
 
@@ -100,7 +101,7 @@ class test(Command):
             yield self.test_suite
 
     def with_project_on_sys_path(self, func):
-        with_2to3 = PY3 and getattr(self.distribution, 'use_2to3', False)
+        with_2to3 = six.PY3 and getattr(self.distribution, 'use_2to3', False)
 
         if with_2to3:
             # If we run 2to3 we can not do this inplace:
@@ -160,7 +161,7 @@ class test(Command):
         # Purge modules under test from sys.modules. The test loader will
         # re-import them from the build location. Required when 2to3 is used
         # with namespace packages.
-        if PY3 and getattr(self.distribution, 'use_2to3', False):
+        if six.PY3 and getattr(self.distribution, 'use_2to3', False):
             module = self.test_suite.split('.')[0]
             if module in _namespace_packages:
                 del_modules = []
diff --git a/setuptools/command/upload_docs.py b/setuptools/command/upload_docs.py
index 001ee936..ca35a3ce 100644
--- a/setuptools/command/upload_docs.py
+++ b/setuptools/command/upload_docs.py
@@ -16,17 +16,19 @@ import tempfile
 import sys
 import shutil
 
-from setuptools.compat import httplib, urlparse, unicode, iteritems, PY3
+from setuptools.extern import six
+from setuptools.extern.six.moves import http_client, urllib
+
 from pkg_resources import iter_entry_points
 
 
-errors = 'surrogateescape' if PY3 else 'strict'
+errors = 'surrogateescape' if six.PY3 else 'strict'
 
 
 # This is not just a replacement for byte literals
 # but works as a general purpose encoder
 def b(s, encoding='utf-8'):
-    if isinstance(s, unicode):
+    if isinstance(s, six.text_type):
         return s.encode(encoding, errors)
     return s
 
@@ -113,7 +115,7 @@ class upload_docs(upload):
         # set up the authentication
         credentials = b(self.username + ':' + self.password)
         credentials = standard_b64encode(credentials)
-        if PY3:
+        if six.PY3:
             credentials = credentials.decode('ascii')
         auth = "Basic " + credentials
 
@@ -122,7 +124,7 @@ class upload_docs(upload):
         sep_boundary = b('\n--') + b(boundary)
         end_boundary = sep_boundary + b('--')
         body = []
-        for key, values in iteritems(data):
+        for key, values in six.iteritems(data):
             title = '\nContent-Disposition: form-data; name="%s"' % key
             # handle multiple entries for the same name
             if not isinstance(values, list):
@@ -150,12 +152,12 @@ class upload_docs(upload):
         # We can't use urllib2 since we need to send the Basic
         # auth right with the first request
         schema, netloc, url, params, query, fragments = \
-            urlparse(self.repository)
+            urllib.parse.urlparse(self.repository)
         assert not params and not query and not fragments
         if schema == 'http':
-            conn = httplib.HTTPConnection(netloc)
+            conn = http_client.HTTPConnection(netloc)
         elif schema == 'https':
-            conn = httplib.HTTPSConnection(netloc)
+            conn = http_client.HTTPSConnection(netloc)
         else:
             raise AssertionError("unsupported schema " + schema)
 
diff --git a/setuptools/compat.py b/setuptools/compat.py
deleted file mode 100644
index f0175a5d..00000000
--- a/setuptools/compat.py
+++ /dev/null
@@ -1,70 +0,0 @@
-import sys
-import itertools
-
-PY3 = sys.version_info >= (3,)
-PY2 = not PY3
-
-if PY2:
-    basestring = basestring
-    import __builtin__ as builtins
-    import ConfigParser as configparser
-    from StringIO import StringIO
-    BytesIO = StringIO
-    func_code = lambda o: o.func_code
-    func_globals = lambda o: o.func_globals
-    im_func = lambda o: o.im_func
-    from htmlentitydefs import name2codepoint
-    import httplib
-    from BaseHTTPServer import HTTPServer
-    from SimpleHTTPServer import SimpleHTTPRequestHandler
-    from BaseHTTPServer import BaseHTTPRequestHandler
-    iteritems = lambda o: o.iteritems()
-    long_type = long
-    maxsize = sys.maxint
-    unichr = unichr
-    unicode = unicode
-    bytes = str
-    from urllib import url2pathname, splittag, pathname2url
-    import urllib2
-    from urllib2 import urlopen, HTTPError, URLError, unquote, splituser
-    from urlparse import urlparse, urlunparse, urljoin, urlsplit, urlunsplit
-    filterfalse = itertools.ifilterfalse
-    filter = itertools.ifilter
-    map = itertools.imap
-
-    exec("""def reraise(tp, value, tb=None):
-    raise tp, value, tb""")
-
-if PY3:
-    basestring = str
-    import builtins
-    import configparser
-    from io import StringIO, BytesIO
-    func_code = lambda o: o.__code__
-    func_globals = lambda o: o.__globals__
-    im_func = lambda o: o.__func__
-    from html.entities import name2codepoint
-    import http.client as httplib
-    from http.server import HTTPServer, SimpleHTTPRequestHandler
-    from http.server import BaseHTTPRequestHandler
-    iteritems = lambda o: o.items()
-    long_type = int
-    maxsize = sys.maxsize
-    unichr = chr
-    unicode = str
-    bytes = bytes
-    from urllib.error import HTTPError, URLError
-    import urllib.request as urllib2
-    from urllib.request import urlopen, url2pathname, pathname2url
-    from urllib.parse import (
-        urlparse, urlunparse, unquote, splituser, urljoin, urlsplit,
-        urlunsplit, splittag,
-    )
-    filterfalse = itertools.filterfalse
-    filter = filter
-    map = map
-
-    def reraise(tp, value, tb=None):
-        if value.__traceback__ is not tb:
-            raise value.with_traceback(tb)
-        raise value
diff --git a/setuptools/depends.py b/setuptools/depends.py
index e87ef3f3..9f7c9a35 100644
--- a/setuptools/depends.py
+++ b/setuptools/depends.py
@@ -3,7 +3,8 @@ import imp
 import marshal
 from imp import PKG_DIRECTORY, PY_COMPILED, PY_SOURCE, PY_FROZEN
 from distutils.version import StrictVersion
-from setuptools import compat
+
+from setuptools.extern import six
 
 __all__ = [
     'Require', 'find_module', 'get_module_constant', 'extract_constant'
@@ -99,7 +100,8 @@ def _iter_code(code):
             ptr += 3
 
             if op==EXTENDED_ARG:
-                extended_arg = arg * compat.long_type(65536)
+                long_type = six.integer_types[-1]
+                extended_arg = arg * long_type(65536)
                 continue
 
         else:
diff --git a/setuptools/dist.py b/setuptools/dist.py
index db15809d..4964a9e8 100644
--- a/setuptools/dist.py
+++ b/setuptools/dist.py
@@ -13,13 +13,13 @@ from distutils.core import Distribution as _Distribution
 from distutils.errors import (DistutilsOptionError, DistutilsPlatformError,
     DistutilsSetupError)
 
+from setuptools.extern import six
+from pkg_resources.extern import packaging
+
 from setuptools.depends import Require
-from setuptools.compat import basestring, PY2
 from setuptools import windows_support
 import pkg_resources
 
-packaging = pkg_resources.packaging
-
 
 def _get_unpatched(cls):
     """Protect against re-patching the distutils if reloaded
@@ -138,7 +138,7 @@ def check_entry_points(dist, attr, value):
         raise DistutilsSetupError(e)
 
 def check_test_suite(dist, attr, value):
-    if not isinstance(value,basestring):
+    if not isinstance(value, six.string_types):
         raise DistutilsSetupError("test_suite must be a string")
 
 def check_package_data(dist, attr, value):
@@ -682,7 +682,7 @@ class Distribution(_Distribution):
         """
         import sys
 
-        if PY2 or self.help_commands:
+        if six.PY2 or self.help_commands:
             return _Distribution.handle_display_options(self, option_order)
 
         # Stdout may be StringIO (e.g. in tests)
diff --git a/setuptools/extern/__init__.py b/setuptools/extern/__init__.py
new file mode 100644
index 00000000..6859aa5b
--- /dev/null
+++ b/setuptools/extern/__init__.py
@@ -0,0 +1,5 @@
+from pkg_resources.extern import VendorImporter
+
+
+names = 'six',
+VendorImporter(__name__, names, 'pkg_resources._vendor').install()
diff --git a/setuptools/package_index.py b/setuptools/package_index.py
index 2c565e88..ea136c09 100755
--- a/setuptools/package_index.py
+++ b/setuptools/package_index.py
@@ -9,6 +9,14 @@ import hashlib
 import itertools
 from functools import wraps
 
+try:
+    from urllib.parse import splituser
+except ImportError:
+    from urllib2 import splituser
+
+from setuptools.extern import six
+from setuptools.extern.six.moves import urllib, http_client, configparser
+
 from pkg_resources import (
     CHECKOUT_DIST, Distribution, BINARY_DIST, normalize_path, SOURCE_DIST,
     require, Environment, find_distributions, safe_name, safe_version,
@@ -17,12 +25,6 @@ from pkg_resources import (
 from setuptools import ssl_support
 from distutils import log
 from distutils.errors import DistutilsError
-from setuptools.compat import (
-    urllib2, httplib, StringIO, HTTPError, urlparse, urlunparse, unquote,
-    splituser, url2pathname, name2codepoint, unichr, urljoin, urlsplit,
-    urlunsplit, configparser, filter, map,
-)
-from setuptools.compat import filterfalse
 from fnmatch import translate
 from setuptools.py26compat import strip_fragment
 from setuptools.py27compat import get_all_headers
@@ -69,10 +71,11 @@ def parse_bdist_wininst(name):
 
 
 def egg_info_for_url(url):
-    scheme, server, path, parameters, query, fragment = urlparse(url)
-    base = unquote(path.split('/')[-1])
+    parts = urllib.parse.urlparse(url)
+    scheme, server, path, parameters, query, fragment = parts
+    base = urllib.parse.unquote(path.split('/')[-1])
     if server=='sourceforge.net' and base=='download':    # XXX Yuck
-        base = unquote(path.split('/')[-2])
+        base = urllib.parse.unquote(path.split('/')[-2])
     if '#' in base: base, fragment = base.split('#',1)
     return base,fragment
 
@@ -158,7 +161,7 @@ def unique_everseen(iterable, key=None):
     seen = set()
     seen_add = seen.add
     if key is None:
-        for element in filterfalse(seen.__contains__, iterable):
+        for element in six.moves.filterfalse(seen.__contains__, iterable):
             seen_add(element)
             yield element
     else:
@@ -190,14 +193,14 @@ def find_external_links(url, page):
         rels = set(map(str.strip, rel.lower().split(',')))
         if 'homepage' in rels or 'download' in rels:
             for match in HREF.finditer(tag):
-                yield urljoin(url, htmldecode(match.group(1)))
+                yield urllib.parse.urljoin(url, htmldecode(match.group(1)))
 
     for tag in ("<th>Home Page", "<th>Download URL"):
         pos = page.find(tag)
         if pos!=-1:
             match = HREF.search(page,pos)
             if match:
-                yield urljoin(url, htmldecode(match.group(1)))
+                yield urllib.parse.urljoin(url, htmldecode(match.group(1)))
 
 user_agent = "Python-urllib/%s setuptools/%s" % (
     sys.version[:3], require('setuptools')[0].version
@@ -240,7 +243,7 @@ class HashChecker(ContentChecker):
     @classmethod
     def from_url(cls, url):
         "Construct a (possibly null) ContentChecker from a URL"
-        fragment = urlparse(url)[-1]
+        fragment = urllib.parse.urlparse(url)[-1]
         if not fragment:
             return ContentChecker()
         match = cls.pattern.search(fragment)
@@ -275,7 +278,7 @@ class PackageIndex(Environment):
         self.to_scan = []
         if verify_ssl and ssl_support.is_available and (ca_bundle or ssl_support.find_ca_bundle()):
             self.opener = ssl_support.opener_for(ca_bundle)
-        else: self.opener = urllib2.urlopen
+        else: self.opener = urllib.request.urlopen
 
     def process_url(self, url, retrieve=False):
         """Evaluate a URL as a possible download, and maybe retrieve it"""
@@ -312,7 +315,7 @@ class PackageIndex(Environment):
         base = f.url     # handle redirects
         page = f.read()
         if not isinstance(page, str): # We are in Python 3 and got bytes. We want str.
-            if isinstance(f, HTTPError):
+            if isinstance(f, urllib.error.HTTPError):
                 # Errors have no charset, assume latin1:
                 charset = 'latin-1'
             else:
@@ -320,7 +323,7 @@ class PackageIndex(Environment):
             page = page.decode(charset, "ignore")
         f.close()
         for match in HREF.finditer(page):
-            link = urljoin(base, htmldecode(match.group(1)))
+            link = urllib.parse.urljoin(base, htmldecode(match.group(1)))
             self.process_url(link)
         if url.startswith(self.index_url) and getattr(f,'code',None)!=404:
             page = self.process_index(url, page)
@@ -343,7 +346,7 @@ class PackageIndex(Environment):
 
     def url_ok(self, url, fatal=False):
         s = URL_SCHEME(url)
-        if (s and s.group(1).lower()=='file') or self.allows(urlparse(url)[1]):
+        if (s and s.group(1).lower()=='file') or self.allows(urllib.parse.urlparse(url)[1]):
             return True
         msg = ("\nNote: Bypassing %s (disallowed host; see "
             "http://bit.ly/1dg9ijs for details).\n")
@@ -384,7 +387,7 @@ class PackageIndex(Environment):
             # Process a URL to see if it's for a package page
             if link.startswith(self.index_url):
                 parts = list(map(
-                    unquote, link[len(self.index_url):].split('/')
+                    urllib.parse.unquote, link[len(self.index_url):].split('/')
                 ))
                 if len(parts)==2 and '#' not in parts[1]:
                     # it's a package page, sanitize and index it
@@ -397,7 +400,7 @@ class PackageIndex(Environment):
         # process an index page into the package-page index
         for match in HREF.finditer(page):
             try:
-                scan(urljoin(url, htmldecode(match.group(1))))
+                scan(urllib.parse.urljoin(url, htmldecode(match.group(1))))
             except ValueError:
                 pass
 
@@ -673,7 +676,7 @@ class PackageIndex(Environment):
         try:
             checker = HashChecker.from_url(url)
             fp = self.open_url(strip_fragment(url))
-            if isinstance(fp, HTTPError):
+            if isinstance(fp, urllib.error.HTTPError):
                 raise DistutilsError(
                     "Can't download %s: %s %s" % (url, fp.code,fp.msg)
                 )
@@ -709,21 +712,21 @@ class PackageIndex(Environment):
             return local_open(url)
         try:
             return open_with_auth(url, self.opener)
-        except (ValueError, httplib.InvalidURL) as v:
+        except (ValueError, http_client.InvalidURL) as v:
             msg = ' '.join([str(arg) for arg in v.args])
             if warning:
                 self.warn(warning, msg)
             else:
                 raise DistutilsError('%s %s' % (url, msg))
-        except urllib2.HTTPError as v:
+        except urllib.error.HTTPError as v:
             return v
-        except urllib2.URLError as v:
+        except urllib.error.URLError as v:
             if warning:
                 self.warn(warning, v.reason)
             else:
                 raise DistutilsError("Download error for %s: %s"
                                      % (url, v.reason))
-        except httplib.BadStatusLine as v:
+        except http_client.BadStatusLine as v:
             if warning:
                 self.warn(warning, v.line)
             else:
@@ -732,7 +735,7 @@ class PackageIndex(Environment):
                     'down, %s' %
                     (url, v.line)
                 )
-        except httplib.HTTPException as v:
+        except http_client.HTTPException as v:
             if warning:
                 self.warn(warning, v)
             else:
@@ -763,7 +766,7 @@ class PackageIndex(Environment):
         elif scheme.startswith('hg+'):
             return self._download_hg(url, filename)
         elif scheme=='file':
-            return url2pathname(urlparse(url)[2])
+            return urllib.request.url2pathname(urllib.parse.urlparse(url)[2])
         else:
             self.url_ok(url, True)   # raises error if not allowed
             return self._attempt_download(url, filename)
@@ -797,7 +800,7 @@ class PackageIndex(Environment):
         url = url.split('#',1)[0]   # remove any fragment for svn's sake
         creds = ''
         if url.lower().startswith('svn:') and '@' in url:
-            scheme, netloc, path, p, q, f = urlparse(url)
+            scheme, netloc, path, p, q, f = urllib.parse.urlparse(url)
             if not netloc and path.startswith('//') and '/' in path[2:]:
                 netloc, path = path[2:].split('/',1)
                 auth, host = splituser(netloc)
@@ -808,14 +811,15 @@ class PackageIndex(Environment):
                     else:
                         creds = " --username="+auth
                     netloc = host
-                    url = urlunparse((scheme, netloc, url, p, q, f))
+                    parts = scheme, netloc, url, p, q, f
+                    url = urllib.parse.urlunparse(parts)
         self.info("Doing subversion checkout from %s to %s", url, filename)
         os.system("svn checkout%s -q %s %s" % (creds, url, filename))
         return filename
 
     @staticmethod
     def _vcs_split_rev_from_url(url, pop_prefix=False):
-        scheme, netloc, path, query, frag = urlsplit(url)
+        scheme, netloc, path, query, frag = urllib.parse.urlsplit(url)
 
         scheme = scheme.split('+', 1)[-1]
 
@@ -827,7 +831,7 @@ class PackageIndex(Environment):
             path, rev = path.rsplit('@', 1)
 
         # Also, discard fragment
-        url = urlunsplit((scheme, netloc, path, query, ''))
+        url = urllib.parse.urlunsplit((scheme, netloc, path, query, ''))
 
         return url, rev
 
@@ -879,7 +883,7 @@ entity_sub = re.compile(r'&(#(\d+|x[\da-fA-F]+)|[\w.:-]+);?').sub
 def uchr(c):
     if not isinstance(c, int):
         return c
-    if c>255: return unichr(c)
+    if c>255: return six.unichr(c)
     return chr(c)
 
 def decode_entity(match):
@@ -889,7 +893,7 @@ def decode_entity(match):
     elif what.startswith('#'):
         what = int(what[1:])
     else:
-        what = name2codepoint.get(what, match.group(0))
+        what = six.moves.html_entities.name2codepoint.get(what, match.group(0))
     return uchr(what)
 
 def htmldecode(text):
@@ -920,7 +924,7 @@ def _encode_auth(auth):
     >>> chr(10) in str(_encode_auth(long_auth))
     False
     """
-    auth_s = unquote(auth)
+    auth_s = urllib.parse.unquote(auth)
     # convert to bytes
     auth_bytes = auth_s.encode()
     # use the legacy interface for Python 2.3 support
@@ -984,15 +988,15 @@ class PyPIConfig(configparser.RawConfigParser):
                 return cred
 
 
-def open_with_auth(url, opener=urllib2.urlopen):
+def open_with_auth(url, opener=urllib.request.urlopen):
     """Open a urllib2 request, handling HTTP authentication"""
 
-    scheme, netloc, path, params, query, frag = urlparse(url)
+    scheme, netloc, path, params, query, frag = urllib.parse.urlparse(url)
 
     # Double scheme does not raise on Mac OS X as revealed by a
     # failing test. We would expect "nonnumeric port". Refs #20.
     if netloc.endswith(':'):
-        raise httplib.InvalidURL("nonnumeric port: ''")
+        raise http_client.InvalidURL("nonnumeric port: ''")
 
     if scheme in ('http', 'https'):
         auth, host = splituser(netloc)
@@ -1008,11 +1012,12 @@ def open_with_auth(url, opener=urllib2.urlopen):
 
     if auth:
         auth = "Basic " + _encode_auth(auth)
-        new_url = urlunparse((scheme,host,path,params,query,frag))
-        request = urllib2.Request(new_url)
+        parts = scheme, host, path, params, query, frag
+        new_url = urllib.parse.urlunparse(parts)
+        request = urllib.request.Request(new_url)
         request.add_header("Authorization", auth)
     else:
-        request = urllib2.Request(url)
+        request = urllib.request.Request(url)
 
     request.add_header('User-Agent', user_agent)
     fp = opener(request)
@@ -1020,9 +1025,10 @@ def open_with_auth(url, opener=urllib2.urlopen):
     if auth:
         # Put authentication info back into request URL if same host,
         # so that links found on the page will work
-        s2, h2, path2, param2, query2, frag2 = urlparse(fp.url)
+        s2, h2, path2, param2, query2, frag2 = urllib.parse.urlparse(fp.url)
         if s2==scheme and h2==host:
-            fp.url = urlunparse((s2,netloc,path2,param2,query2,frag2))
+            parts = s2, netloc, path2, param2, query2, frag2
+            fp.url = urllib.parse.urlunparse(parts)
 
     return fp
 
@@ -1035,10 +1041,10 @@ def fix_sf_url(url):
 
 def local_open(url):
     """Read a local path, with special support for directories"""
-    scheme, server, path, param, query, frag = urlparse(url)
-    filename = url2pathname(path)
+    scheme, server, path, param, query, frag = urllib.parse.urlparse(url)
+    filename = urllib.request.url2pathname(path)
     if os.path.isfile(filename):
-        return urllib2.urlopen(url)
+        return urllib.request.urlopen(url)
     elif path.endswith('/') and os.path.isdir(filename):
         files = []
         for f in os.listdir(filename):
@@ -1059,4 +1065,5 @@ def local_open(url):
         status, message, body = 404, "Path not found", "Not found"
 
     headers = {'content-type': 'text/html'}
-    return HTTPError(url, status, message, headers, StringIO(body))
+    body_stream = six.StringIO(body)
+    return urllib.error.HTTPError(url, status, message, headers, body_stream)
diff --git a/setuptools/py26compat.py b/setuptools/py26compat.py
index 738b0cc4..e52bd85b 100644
--- a/setuptools/py26compat.py
+++ b/setuptools/py26compat.py
@@ -4,7 +4,10 @@ Compatibility Support for Python 2.6 and earlier
 
 import sys
 
-from setuptools.compat import splittag
+try:
+	from urllib.parse import splittag
+except ImportError:
+	from urllib import splittag
 
 def strip_fragment(url):
 	"""
diff --git a/setuptools/sandbox.py b/setuptools/sandbox.py
index 85de85ff..37035f37 100755
--- a/setuptools/sandbox.py
+++ b/setuptools/sandbox.py
@@ -8,6 +8,9 @@ import re
 import contextlib
 import pickle
 
+from setuptools.extern import six
+from setuptools.extern.six.moves import builtins
+
 import pkg_resources
 
 if sys.platform.startswith('java'):
@@ -22,9 +25,6 @@ _open = open
 from distutils.errors import DistutilsError
 from pkg_resources import working_set
 
-from setuptools import compat
-from setuptools.compat import builtins
-
 __all__ = [
     "AbstractSandbox", "DirectorySandbox", "SandboxViolation", "run_setup",
 ]
@@ -138,7 +138,7 @@ class ExceptionSaver:
             return
 
         type, exc = map(pickle.loads, self._saved)
-        compat.reraise(type, exc, self._tb)
+        six.reraise(type, exc, self._tb)
 
 
 @contextlib.contextmanager
diff --git a/setuptools/ssl_support.py b/setuptools/ssl_support.py
index 7394f4f5..7baedd19 100644
--- a/setuptools/ssl_support.py
+++ b/setuptools/ssl_support.py
@@ -3,9 +3,10 @@ import socket
 import atexit
 import re
 
+from setuptools.extern.six.moves import urllib, http_client
+
 import pkg_resources
 from pkg_resources import ResolutionError, ExtractionError
-from setuptools.compat import urllib2
 
 try:
     import ssl
@@ -27,17 +28,11 @@ cert_paths = """
 """.strip().split()
 
 
-HTTPSHandler = HTTPSConnection = object
-
-for what, where in (
-    ('HTTPSHandler', ['urllib2','urllib.request']),
-    ('HTTPSConnection', ['httplib', 'http.client']),
-):
-    for module in where:
-        try:
-            exec("from %s import %s" % (module, what))
-        except ImportError:
-            pass
+try:
+    HTTPSHandler = urllib.request.HTTPSHandler
+    HTTPSConnection = http_client.HTTPSConnection
+except AttributeError:
+    HTTPSHandler = HTTPSConnection = object
 
 is_available = ssl is not None and object not in (HTTPSHandler, HTTPSConnection)
 
@@ -198,7 +193,7 @@ class VerifyingHTTPSConn(HTTPSConnection):
 
 def opener_for(ca_bundle=None):
     """Get a urlopen() replacement that uses ca_bundle for verification"""
-    return urllib2.build_opener(
+    return urllib.request.build_opener(
         VerifyingHTTPSHandler(ca_bundle or find_ca_bundle())
     ).open
 
diff --git a/setuptools/tests/__init__.py b/setuptools/tests/__init__.py
index f985a6e4..32447356 100644
--- a/setuptools/tests/__init__.py
+++ b/setuptools/tests/__init__.py
@@ -7,8 +7,8 @@ from distutils.errors import DistutilsOptionError, DistutilsPlatformError
 from distutils.errors import DistutilsSetupError
 from distutils.core import Extension
 from distutils.version import LooseVersion
-from setuptools.compat import func_code
 
+from setuptools.extern import six
 import pytest
 
 import setuptools.dist
@@ -52,7 +52,7 @@ class TestDepends:
             x = "test"
             y = z
 
-        fc = func_code(f1)
+        fc = six.get_function_code(f1)
 
         # unrecognized name
         assert dep.extract_constant(fc,'q', -1) is None
diff --git a/setuptools/tests/contexts.py b/setuptools/tests/contexts.py
index 1d29284b..8c9a2d3e 100644
--- a/setuptools/tests/contexts.py
+++ b/setuptools/tests/contexts.py
@@ -5,7 +5,7 @@ import sys
 import contextlib
 import site
 
-from ..compat import StringIO
+from setuptools.extern import six
 
 
 @contextlib.contextmanager
@@ -57,8 +57,8 @@ def quiet():
 
     old_stdout = sys.stdout
     old_stderr = sys.stderr
-    new_stdout = sys.stdout = StringIO()
-    new_stderr = sys.stderr = StringIO()
+    new_stdout = sys.stdout = six.StringIO()
+    new_stderr = sys.stderr = six.StringIO()
     try:
         yield new_stdout, new_stderr
     finally:
diff --git a/setuptools/tests/server.py b/setuptools/tests/server.py
index 6b214279..6a687937 100644
--- a/setuptools/tests/server.py
+++ b/setuptools/tests/server.py
@@ -3,10 +3,11 @@
 
 import time
 import threading
-from setuptools.compat import BaseHTTPRequestHandler
-from setuptools.compat import HTTPServer, SimpleHTTPRequestHandler
 
-class IndexServer(HTTPServer):
+from setuptools.extern.six.moves import BaseHTTPServer, SimpleHTTPServer
+
+
+class IndexServer(BaseHTTPServer.HTTPServer):
     """Basic single-threaded http server simulating a package index
 
     You can use this server in unittest like this::
@@ -18,8 +19,9 @@ class IndexServer(HTTPServer):
         s.stop()
     """
     def __init__(self, server_address=('', 0),
-            RequestHandlerClass=SimpleHTTPRequestHandler):
-        HTTPServer.__init__(self, server_address, RequestHandlerClass)
+            RequestHandlerClass=SimpleHTTPServer.SimpleHTTPRequestHandler):
+        BaseHTTPServer.HTTPServer.__init__(self, server_address,
+            RequestHandlerClass)
         self._run = True
 
     def start(self):
@@ -40,19 +42,20 @@ class IndexServer(HTTPServer):
         port = self.server_port
         return 'http://127.0.0.1:%s/setuptools/tests/indexes/' % port
 
-class RequestRecorder(BaseHTTPRequestHandler):
+class RequestRecorder(BaseHTTPServer.BaseHTTPRequestHandler):
     def do_GET(self):
         requests = vars(self.server).setdefault('requests', [])
         requests.append(self)
         self.send_response(200, 'OK')
 
-class MockServer(HTTPServer, threading.Thread):
+class MockServer(BaseHTTPServer.HTTPServer, threading.Thread):
     """
     A simple HTTP Server that records the requests made to it.
     """
     def __init__(self, server_address=('', 0),
             RequestHandlerClass=RequestRecorder):
-        HTTPServer.__init__(self, server_address, RequestHandlerClass)
+        BaseHTTPServer.HTTPServer.__init__(self, server_address,
+            RequestHandlerClass)
         threading.Thread.__init__(self)
         self.setDaemon(True)
         self.requests = []
diff --git a/setuptools/tests/test_develop.py b/setuptools/tests/test_develop.py
index ab5da00e..1b844499 100644
--- a/setuptools/tests/test_develop.py
+++ b/setuptools/tests/test_develop.py
@@ -5,12 +5,13 @@ import site
 import sys
 import io
 
+from setuptools.extern import six
+
 import pytest
 
 from setuptools.command.develop import develop
 from setuptools.dist import Distribution
 from . import contexts
-from setuptools.compat import PY3
 
 
 SETUP_PY = """\
@@ -85,7 +86,7 @@ class TestDevelop:
         with io.open(fn) as init_file:
             init = init_file.read().strip()
 
-        expected = 'print("foo")' if PY3 else 'print "foo"'
+        expected = 'print("foo")' if six.PY3 else 'print "foo"'
         assert init == expected
 
     def test_console_scripts(self, tmpdir):
diff --git a/setuptools/tests/test_easy_install.py b/setuptools/tests/test_easy_install.py
index f0330f17..94e317b3 100644
--- a/setuptools/tests/test_easy_install.py
+++ b/setuptools/tests/test_easy_install.py
@@ -14,6 +14,10 @@ import tarfile
 import logging
 import itertools
 import distutils.errors
+import io
+
+from setuptools.extern import six
+from setuptools.extern.six.moves import urllib
 
 import pytest
 try:
@@ -22,8 +26,6 @@ except ImportError:
     import mock
 
 from setuptools import sandbox
-from setuptools import compat
-from setuptools.compat import StringIO, BytesIO, urlparse
 from setuptools.sandbox import run_setup
 import setuptools.command.easy_install as ei
 from setuptools.command.easy_install import PthDistributions
@@ -272,7 +274,7 @@ class TestSetupRequires:
         p_index = setuptools.tests.server.MockServer()
         p_index.start()
         netloc = 1
-        p_index_loc = urlparse(p_index.url)[netloc]
+        p_index_loc = urllib.parse.urlparse(p_index.url)[netloc]
         if p_index_loc.endswith(':0'):
             # Some platforms (Jython) don't find a port to which to bind,
             #  so skip this test for them.
@@ -391,12 +393,7 @@ def make_trivial_sdist(dist_path, setup_py):
     """
 
     setup_py_file = tarfile.TarInfo(name='setup.py')
-    try:
-        # Python 3 (StringIO gets converted to io module)
-        MemFile = BytesIO
-    except AttributeError:
-        MemFile = StringIO
-    setup_py_bytes = MemFile(setup_py.encode('utf-8'))
+    setup_py_bytes = io.BytesIO(setup_py.encode('utf-8'))
     setup_py_file.size = len(setup_py_bytes.getvalue())
     with tarfile_open(dist_path, 'w:gz') as dist:
         dist.addfile(setup_py_file, fileobj=setup_py_bytes)
@@ -431,7 +428,7 @@ class TestScriptHeader:
         assert actual == expected
 
     @pytest.mark.xfail(
-        compat.PY3 and is_ascii,
+        six.PY3 and is_ascii,
         reason="Test fails in this locale on Python 3"
     )
     @mock.patch.dict(sys.modules, java=mock.Mock(lang=mock.Mock(System=
diff --git a/setuptools/tests/test_integration.py b/setuptools/tests/test_integration.py
index 07f06db2..04772ba5 100644
--- a/setuptools/tests/test_integration.py
+++ b/setuptools/tests/test_integration.py
@@ -7,12 +7,12 @@ import glob
 import os
 import sys
 
+from setuptools.extern.six.moves import urllib
 import pytest
 
 from setuptools.command.easy_install import easy_install
 from setuptools.command import easy_install as easy_install_pkg
 from setuptools.dist import Distribution
-from setuptools.compat import urlopen
 
 
 def setup_module(module):
@@ -26,7 +26,7 @@ def setup_module(module):
             pass
 
     try:
-        urlopen('https://pypi.python.org/pypi')
+        urllib.request.urlopen('https://pypi.python.org/pypi')
     except Exception as exc:
         pytest.skip(str(exc))
 
diff --git a/setuptools/tests/test_packageindex.py b/setuptools/tests/test_packageindex.py
index 746860d5..6a76b5fc 100644
--- a/setuptools/tests/test_packageindex.py
+++ b/setuptools/tests/test_packageindex.py
@@ -4,9 +4,10 @@ import sys
 import os
 import distutils.errors
 
-from setuptools.compat import httplib, HTTPError, unicode, pathname2url
-from .textwrap import DALS
+from setuptools.extern import six
+from setuptools.extern.six.moves import urllib, http_client
 
+from .textwrap import DALS
 import pkg_resources
 import setuptools.package_index
 from setuptools.tests.server import IndexServer
@@ -22,7 +23,7 @@ class TestPackageIndex:
         except Exception as v:
             assert url in str(v)
         else:
-            assert isinstance(v, HTTPError)
+            assert isinstance(v, urllib.error.HTTPError)
 
     def test_bad_url_typo(self):
         # issue 16
@@ -38,7 +39,7 @@ class TestPackageIndex:
         except Exception as v:
             assert url in str(v)
         else:
-            assert isinstance(v, HTTPError)
+            assert isinstance(v, urllib.error.HTTPError)
 
     def test_bad_url_bad_status_line(self):
         index = setuptools.package_index.PackageIndex(
@@ -46,7 +47,7 @@ class TestPackageIndex:
         )
 
         def _urlopen(*args):
-            raise httplib.BadStatusLine('line')
+            raise http_client.BadStatusLine('line')
 
         index.opener = _urlopen
         url = 'http://example.com'
@@ -70,7 +71,7 @@ class TestPackageIndex:
         try:
             index.open_url(url)
         except distutils.errors.DistutilsError as error:
-            msg = unicode(error)
+            msg = six.text_type(error)
             assert 'nonnumeric port' in msg or 'getaddrinfo failed' in msg or 'Name or service not known' in msg
             return
         raise RuntimeError("Did not raise")
@@ -167,7 +168,7 @@ class TestPackageIndex:
         index_file = tmpdir / 'index.html'
         with index_file.open('w') as f:
             f.write('<div>content</div>')
-        url = 'file:' + pathname2url(str(tmpdir)) + '/'
+        url = 'file:' + urllib.request.pathname2url(str(tmpdir)) + '/'
         res = setuptools.package_index.local_open(url)
         assert 'content' in res.read()
 
diff --git a/setuptools/tests/test_sdist.py b/setuptools/tests/test_sdist.py
index 8ec9a4cb..753b507d 100644
--- a/setuptools/tests/test_sdist.py
+++ b/setuptools/tests/test_sdist.py
@@ -9,17 +9,18 @@ import unicodedata
 import contextlib
 import io
 
+from setuptools.extern import six
+
 import pytest
 
 import pkg_resources
-from setuptools.compat import StringIO, unicode, PY3, PY2
 from setuptools.command.sdist import sdist
 from setuptools.command.egg_info import manifest_maker
 from setuptools.dist import Distribution
 from setuptools.tests import fail_on_ascii
 
 
-py3_only = pytest.mark.xfail(PY2, reason="Test runs on Python 3 only")
+py3_only = pytest.mark.xfail(six.PY2, reason="Test runs on Python 3 only")
 
 
 SETUP_ATTRS = {
@@ -37,7 +38,7 @@ setup(**%r)
 """ % SETUP_ATTRS
 
 
-if PY3:
+if six.PY3:
     LATIN1_FILENAME = 'smörbröd.py'.encode('latin-1')
 else:
     LATIN1_FILENAME = 'sm\xf6rbr\xf6d.py'
@@ -47,7 +48,7 @@ else:
 @contextlib.contextmanager
 def quiet():
     old_stdout, old_stderr = sys.stdout, sys.stderr
-    sys.stdout, sys.stderr = StringIO(), StringIO()
+    sys.stdout, sys.stderr = six.StringIO(), six.StringIO()
     try:
         yield
     finally:
@@ -56,14 +57,14 @@ def quiet():
 
 # Fake byte literals for Python <= 2.5
 def b(s, encoding='utf-8'):
-    if PY3:
+    if six.PY3:
         return s.encode(encoding)
     return s
 
 
 # Convert to POSIX path
 def posix(path):
-    if PY3 and not isinstance(path, str):
+    if six.PY3 and not isinstance(path, str):
         return path.replace(os.sep.encode('ascii'), b('/'))
     else:
         return path.replace(os.sep, '/')
@@ -71,7 +72,7 @@ def posix(path):
 
 # HFS Plus uses decomposed UTF-8
 def decompose(path):
-    if isinstance(path, unicode):
+    if isinstance(path, six.text_type):
         return unicodedata.normalize('NFD', path)
     try:
         path = path.decode('utf-8')
@@ -184,7 +185,7 @@ class TestSdistTest:
         u_contents = contents.decode('UTF-8')
 
         # The manifest should contain the UTF-8 filename
-        if PY2:
+        if six.PY2:
             fs_enc = sys.getfilesystemencoding()
             filename = filename.decode(fs_enc)
 
@@ -289,7 +290,7 @@ class TestSdistTest:
             cmd.read_manifest()
 
         # The filelist should contain the UTF-8 filename
-        if PY3:
+        if six.PY3:
             filename = filename.decode('utf-8')
         assert filename in cmd.filelist.files
 
@@ -342,7 +343,7 @@ class TestSdistTest:
         if sys.platform == 'darwin':
             filename = decompose(filename)
 
-        if PY3:
+        if six.PY3:
             fs_enc = sys.getfilesystemencoding()
 
             if sys.platform == 'win32':
@@ -374,7 +375,7 @@ class TestSdistTest:
         with quiet():
             cmd.run()
 
-        if PY3:
+        if six.PY3:
             # not all windows systems have a default FS encoding of cp1252
             if sys.platform == 'win32':
                 # Latin-1 is similar to Windows-1252 however
diff --git a/setuptools/tests/test_test.py b/setuptools/tests/test_test.py
index a66294c9..4155a5b1 100644
--- a/setuptools/tests/test_test.py
+++ b/setuptools/tests/test_test.py
@@ -4,6 +4,7 @@ from __future__ import unicode_literals
 
 import os
 import site
+from distutils.errors import DistutilsError
 
 import pytest
 
diff --git a/setuptools/unicode_utils.py b/setuptools/unicode_utils.py
index d2de941a..18903d9e 100644
--- a/setuptools/unicode_utils.py
+++ b/setuptools/unicode_utils.py
@@ -1,11 +1,11 @@
 import unicodedata
 import sys
-from setuptools.compat import unicode as decoded_string
 
+from setuptools.extern import six
 
 # HFS Plus uses decomposed UTF-8
 def decompose(path):
-    if isinstance(path, decoded_string):
+    if isinstance(path, six.text_type):
         return unicodedata.normalize('NFD', path)
     try:
         path = path.decode('utf-8')
@@ -23,7 +23,7 @@ def filesys_decode(path):
     """
 
     fs_enc = sys.getfilesystemencoding()
-    if isinstance(path, decoded_string):
+    if isinstance(path, six.text_type):
         return path
 
     for enc in (fs_enc, "utf-8"):
diff --git a/tests/manual_test.py b/tests/manual_test.py
index e6489b1c..af4ec09b 100644
--- a/tests/manual_test.py
+++ b/tests/manual_test.py
@@ -7,7 +7,8 @@ import tempfile
 import subprocess
 from distutils.command.install import INSTALL_SCHEMES
 from string import Template
-from setuptools.compat import urlopen
+
+from six.moves import urllib
 
 def _system_call(*args):
     assert subprocess.call(args) == 0
@@ -76,7 +77,7 @@ def test_full():
         f.write(SIMPLE_BUILDOUT)
 
     with open('bootstrap.py', 'w') as f:
-        f.write(urlopen(BOOTSTRAP).read())
+        f.write(urllib.request.urlopen(BOOTSTRAP).read())
 
     _system_call('bin/python', 'bootstrap.py')
     _system_call('bin/buildout', '-q')