https://sebastianraschka.com/Articles/2014_python_scope_and_namespaces.html
https://stackoverflow.com/questions/4020419/why-arent-python-nested-functions-called-closures
Original: https://www.cnblogs.com/WCFGROUP/p/11333410.html
Author: 暖风的风
Title: python_scope_and_namespaces_closures
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