[issue42955] Add sys.module_names: list of stdlib module names (Python and extension modules)

[Ronald Oussoren]

Ronald Oussoren <ronaldoussoren at mac.com> added the comment:

BTW. A list of stdlib module names is not sufficient to determine if a module is in the stdlib, thanks to .pth files it is possible to have entries on sys.path before the stdlib.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue42955>
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