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Edit File: setuptools_ext.cpython-39.opt-1.pyc
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Do not alter the setting if it already exists. Setuptools takes care of ignoring the flag on Python 2 and PyPy. CPython itself should ignore the flag in a debugging version (by not listing .abi3.so in the extensions it supports), but it doesn't so far, creating troubles. That's why we check for "not hasattr(sys, 'gettotalrefcount')" (the 2.7 compatible equivalent of 'd' not in sys.abiflags). (http://bugs.python.org/issue28401) On Windows, with CPython <= 3.4, it's better not to use py_limited_api because virtualenv *still* doesn't copy PYTHON3.DLL on these versions. Recently (2020) we started shipping only >= 3.5 wheels, though. 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