Spurious unused-import warning when imported variable is used as metaclass or as function annotation

[pylint-bot]

Originally reported by: Antony Lee (BitBucket: anntzer, GitHub: @anntzer?)

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#!python
from abc import ABCMeta

class C(metaclass=ABCMeta):
    pass

def f(arg: ABCMeta):
    pass

Pylint doesn't detect either use of ABCMeta and warns that the import is unused.

I first created this issue on the astroid tracker (https://bitbucket.org/logilab/astroid/issue/14/spurious-unused-import-warning-when) but @PCManticore suggested that I move it here.

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• Bitbucket: https://bitbucket.org/logilab/pylint/issue/143

[pylint-bot]

Original comment by Claudiu Popa (BitBucket: PCManticore, GitHub: @PCManticore):

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Fix unused-import false positive with Python 3 metaclasses. Closes issue #143.

[pylint-bot]

Original comment by Claudiu Popa (BitBucket: PCManticore, GitHub: @PCManticore):

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I just fix the first component of this issue. The part with annotations can't be fixed right now, I have to deal with https://bitbucket.org/logilab/astroid/issue/30/function-annotation-support first.

[pylint-bot]

Original comment by Claudiu Popa (BitBucket: PCManticore, GitHub: @PCManticore):

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See #227 for the annotation issue.