Merge with upstream

--HG--
branch : distribute

1 files changed, 13 insertions, 7 deletions

diff --git a/setuptools/sandbox.py b/setuptools/sandbox.py
index 41f1119b..c49d1cfe 100755
--- a/setuptools/sandbox.py
+++ b/setuptools/sandbox.py
@@ -42,8 +42,14 @@ def run_setup(setup_script, args):
     finally:
         pkg_resources.__setstate__(pr_state)
         sys.modules.update(save_modules)
-        for key in list(sys.modules):
-            if key not in save_modules: del sys.modules[key]
+        # remove any modules imported within the sandbox
+        del_modules = [
+            mod_name for mod_name in sys.modules
+            if mod_name not in save_modules
+            # exclude any encodings modules. See #285
+            and not mod_name.startswith('encodings.')
+        ]
+        map(sys.modules.__delitem__, del_modules)
         os.chdir(old_dir)
         sys.path[:] = save_path
         sys.argv[:] = save_argv
@@ -163,12 +169,12 @@ else:
     _EXCEPTIONS = []
 
 try:
-	from win32com.client.gencache import GetGeneratePath
-	_EXCEPTIONS.append(GetGeneratePath())
-	del GetGeneratePath
+    from win32com.client.gencache import GetGeneratePath
+    _EXCEPTIONS.append(GetGeneratePath())
+    del GetGeneratePath
 except ImportError:
-	# it appears pywin32 is not installed, so no need to exclude.
-	pass
+    # it appears pywin32 is not installed, so no need to exclude.
+    pass
 
 class DirectorySandbox(AbstractSandbox):
     """Restrict operations to a single subdirectory - pseudo-chroot"""