[issue15681] PEP 3121 refactoring applied to binascii module

[STINNER Victor]

Change by STINNER Victor <vstinner at python.org>:


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superseder: Port the standard library to PEP 489 multiphase initialization -> Py_Finalize() doesn't clear all Python objects at exit

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue15681>
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