Close #19734: ignore pip env vars in ensurepip
diff --git a/Lib/ensurepip/__init__.py b/Lib/ensurepip/__init__.py
index b6bc4b6..5ceda51 100644
--- a/Lib/ensurepip/__init__.py
+++ b/Lib/ensurepip/__init__.py
@@ -43,10 +43,18 @@
"""
Bootstrap pip into the current Python installation (or the given root
directory).
+
+ Note that calling this function will alter both sys.path and os.environ.
"""
if altinstall and default_pip:
raise ValueError("Cannot use altinstall and default_pip together")
+ # We deliberately ignore all pip environment variables
+ # See http://bugs.python.org/issue19734 for details
+ keys_to_remove = [k for k in os.environ if k.startswith("PIP_")]
+ for k in keys_to_remove:
+ del os.environ[k]
+
# By default, installing pip and setuptools installs all of the
# following scripts (X.Y == running Python version):
#