STINNER Victor <[email protected]> added the comment:
Before commit 8334f30a74abcf7e469b901afc307887aa85a888, at the first
_imp.create_builtin() calls, it calls _PyImport_FixupExtensionObject() which
stores the created module in an internal "extensions" dictionary.
PyInit__weakref() returns a module object. Next calls to
_imp.create_builtin("_weakref") simply returned the cached _weakref module.
At commit 8334f30a74abcf7e469b901afc307887aa85a888, _imp.create_builtin()
doesn't store it in the internal "extensions" dictionary, but calls
PyModule_FromDefAndSpec() instead. PyInit__weakref() returns a module
definition (PyModuleDef_Type: "moduledef"). Each
_imp.create_builtin("_weakref") creates a new module.
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<https://bugs.python.org/issue40050>
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