Add docstring

8759ca96 · Jason R. Coombs · 813855aa · 8759ca96
Commit 8759ca96 authored Sep 26, 2014 by Jason R. Coombs
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setuptools/tests/test_msvc9compiler.py setuptools/tests/test_msvc9compiler.py +4 -0

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--- a/setuptools/tests/test_msvc9compiler.py
+++ b/setuptools/tests/test_msvc9compiler.py
@@ -61,6 +61,10 @@ class MockReg:

 @contextlib.contextmanager
 def patch_env(**replacements):
+    """
+    In a context, patch the environment with replacements. Pass None values
+    to clear the values.
+    """
    saved = dict(
        (key, os.environ['key'])
        for key in replacements