[issue26131] Raise ImportWarning when loader.load_module() is used

[Brett Cannon]

Brett Cannon <brett at python.org> added the comment:

What is "VendorImporter" (see the message of the ImportWarning)? That's not in the stdlib, so it looks like your system is injecting something via some `.pth` file or environment variable that doesn't define exec_module().

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue26131>
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