import sys import platform def add_ext_suffix_39(vars): """ Ensure vars contains 'EXT_SUFFIX'. pypa/distutils#130 """ import _imp ext_suffix = _imp.extension_suffixes()[0] vars.update( EXT_SUFFIX=ext_suffix, # sysconfig sets SO to match EXT_SUFFIX, so maintain # that expectation. # https://github.com/python/cpython/blob/785cc6770588de087d09e89a69110af2542be208/Lib/sysconfig.py#L671-L673 SO=ext_suffix, ) needs_ext_suffix = sys.version_info < (3, 10) and platform.system() == 'Windows' add_ext_suffix = add_ext_suffix_39 if needs_ext_suffix else lambda vars: None