[issue32691] "pdb -m <module>" sets __main__.__package__ incorrectly

[Nick Coghlan]

Nick Coghlan <ncoghlan at gmail.com> added the comment:

I forget we had mod_spec.parent available to us these days, so yes, we should use that rather than recalculating the parent with str.rpartition.

As Mario noted, we only want to change the behaviour when the executed module is a plain module or submodule, rather than being a package in its own right with a pkg.__main__ submodule (since the current behaviour is correct in the latter case).

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<https://bugs.python.org/issue32691>
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