[2.7] bpo-31471: Fix assertion failure in subprocess.Popen() on Windows, in case env has a bad keys() method. (GH-3580) #3595
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the implementation of
PyMapping_Keys()andPyMapping_Values()is different in 2.7, so the test we added totest_subprocess.pyin 3.7 doesn't cause an assertion failure in 2.7.we backport the change to
getenvironment()anyway, because it is simple, and might prevent bugs we haven't thought of.(this is a partial backport of #3580)
https://bugs.python.org/issue31471