Silence PEP440Warning by default unless invoking easy_install

2 files changed, 12 insertions, 0 deletions

diff --git a/pkg_resources.py b/pkg_resources.py
index 87fd2782..3a8edca5 100644
--- a/pkg_resources.py
+++ b/pkg_resources.py
@@ -2932,6 +2932,13 @@ def _mkstemp(*args,**kw):
         os.open = old_open
 
 
+# Silence the PEP440Warning by default, so that end users don't get hit by it
+# randomly just because they use pkg_resources. We want to append the rule
+# because we want earlier uses of filterwarnings to take precedence over this
+# one.
+warnings.filterwarnings("ignore", category=PEP440Warning, append=True)
+
+
 # Set up global resource manager (deliberately not state-saved)
 _manager = ResourceManager()
 def _initialize(g):
diff --git a/setuptools/command/easy_install.py b/setuptools/command/easy_install.py
index 2e00b996..a71a7f36 100755
--- a/setuptools/command/easy_install.py
+++ b/setuptools/command/easy_install.py
@@ -54,9 +54,14 @@ from pkg_resources import (
 import pkg_resources
 
 
+# Turn on PEP440Warnings
+warnings.filterwarnings("default", category=pkg_resources.PEP440Warning)
+
+
 sys_executable = os.environ.get('__PYVENV_LAUNCHER__',
                                 os.path.normpath(sys.executable))
 
+
 __all__ = [
     'samefile', 'easy_install', 'PthDistributions', 'extract_wininst_cfg',
     'main', 'get_exe_prefixes',