Special case __main__ in is_namespace()

[jacobtylerwalls]

Type of Changes

	Type
✓	🐛 Bug fix

Related Issue

Glad that this one was not a head scratcher. __main__ is a special case where __spec__ might be None.

Resolves primer failure in pylint. Caused very recently (unreleased) in #1536, so not documented.

[coveralls]

Pull Request Test Coverage Report for Build 2412176420

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 91.928%

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Totals
Change from base Build 2411634132:	0.0%
Covered Lines:	9247
Relevant Lines:	10059

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💛 - Coveralls

[Pierre-Sassoulas]

👍

[DanielNoord]

Still seeing a crash on pandas:
https://github.com/PyCQA/pylint/runs/6669595502?check_suite_focus=true

Do we need to special case _path__ as well?

[jacobtylerwalls]

I'm trying to see if I can reproduce it locally with just pandas. I think it's possible there's contamination between package names in various primer projects. Instead of cd'ing to each project and linting them separately, we're linting from a cwd that is not a package, just an arbitrary dir. These are edge cases worth fixing, but if pandas lints fine by itself, I just think it's worth observing that these are not "ten thumbs up an hour" kind of cases, since people generally aren't linting their entire venv of packages, unless you're me, and you found #1547 that way :D

[jacobtylerwalls]

See #1581 for the resolution.