ignored-modules should turn no-name-in-module-off

[pylint-bot]

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

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I believe no-name-in-module is basically the same as no-member (for modules), except that the former triggers at "from ... import" statements. Modules in the "ignore-modules" list should thus be ignored for no-name-in-module too.

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• Bitbucket: https://bitbucket.org/logilab/pylint/issue/223

[pylint-bot]

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

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Don't emit 'no-name-in-module' for ignored modules. Closes issue #223.

[pylint-bot]

Original comment by Buck Evan (BitBucket: bukzor, GitHub: @bukzor?):

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I'm fairly sure this has regressed.

Test case:

#!python

from distutils.util import strtobool
from six.moves import configparser
from six.moves.urllib import parse as urllib_parse
from six.moves.urllib import request as urllib_request


print strtobool
print configparser
print urllib_parse
print urllib_request

pylintrc:

#!dosini

[TYPECHECK]
ignored-modules=distutils,distutils.util,six,six.moves,_MovedItems
ignored-classes=distutils,distutils.util,six,six.moves,_MovedItems

Expected: no errors.

Actual result:

************* Module example
F:  1, 0: Unable to import 'distutils.util' (import-error)
E:  1, 0: No name 'util' in module 'distutils' (no-name-in-module)
F:  2, 0: Unable to import 'six.moves' (import-error)
F:  3, 0: Unable to import 'six.moves.urllib' (import-error)
E:  3, 0: No name 'urllib' in module '_MovedItems' (no-name-in-module)
F:  4, 0: Unable to import 'six.moves.urllib' (import-error)
E:  4, 0: No name 'urllib' in module '_MovedItems' (no-name-in-module)

[pylint-bot]

Original comment by Buck Evan (BitBucket: bukzor, GitHub: @bukzor?):

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See also: pypa/pip#2048 (comment)

[pylint-bot]

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

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Maybe a pylintrc problem? I get the following:

#!python

C:  1, 0: Missing module docstring (missing-docstring)
F:  2, 0: Unable to import 'six.moves' (import-error)
F:  3, 0: Unable to import 'six.moves.urllib' (import-error)
F:  4, 0: Unable to import 'six.moves.urllib' (import-error)
W:  1, 0: Unused strtobool imported from distutils.util (unused-import)
W:  2, 0: Unused configparser imported from six.moves (unused-import)
W:  3, 0: Unused parse imported from six.moves.urllib as urllib_parse (unused-import)
W:  4, 0: Unused request imported from six.moves.urllib as urllib_request (unused-import)

Note that ignored-modules works only for no-name-in-module, it doesn't filter out import-errors. Regarding the distutils message, did you use venv? Pylint does have some problem with virtualenvs, see #73/pylint-is-unable-to-import for reference.

[pylint-bot]

Original comment by Buck Evan (BitBucket: bukzor, GitHub: @bukzor?):

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Yes I was in a virtualenv. They replace the distutils namespace with some black-magic code that can't be statically analysed. Regardless, there should be a way to configure pylintrc to avoid lint errors using six.moves.

I see that you didn't copy my example verbatim, since I have the prints there.

I also strongly suspect you don't have six installed.

[pylint-bot]

Original comment by Buck Evan (BitBucket: bukzor, GitHub: @bukzor?):

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For modules that do black magic to add module objects to themselves at runtime (six.moves, distutils under virtualenv), no-name-in-module is equivalent to import-error. I'm fairly certain that the same argument applies as in the original post, when the import error is for a submodule of an ignored-module.

[pylint-bot]

Original comment by Buck Evan (BitBucket: bukzor, GitHub: @bukzor?):

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The py module is another one of these.

Do you want a fresh ticket for this issue?

[pylint-bot]

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

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No, I don't have six installed. You can still disable import-errors using disable or do you want something specific for six? Anyway, the problem with distutils should be fixed in the referenced issue (73), not in this one, which was for something totally different.

[pylint-bot]

Original comment by Buck Evan (BitBucket: bukzor, GitHub: @bukzor?):

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@claudiupopa Are you available on freenode?
I'm in #pylint.

[pylint-bot]

Original comment by Buck Evan (BitBucket: bukzor, GitHub: @bukzor?):

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Disabling all import errors for the entire project isn't an agreeable workaround.
My workaround for the moment is an if True block with #pylint:disable=import-errors.
This is quite ugly and makes it hard to sell pylint to the skeptical (AlexGaynor and dstufft in the pip project).

Do you agree on the above assertion that import-error and no-name-in-module is equivalent for these dynamic namespaces?
If so, we can improve the current configuration to work for this use case.
If not, we can add a separate configuration (dynamic_modules ?) for it, but I imagine they will be equal in practice.

[pylint-bot]

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

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Fair enough. I wasn't talking about disabling all the imports, only the ones where Pylint has troubles detecting them. My only concern is that ignored-modules will change semantics, so people will expect that it will filter out only attribute access, not import-errors as well, but it's a small concern in the face of the popularity of the framework.

[pylint-bot]

Original comment by Buck Evan (BitBucket: bukzor, GitHub: @bukzor?):

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@claudiupopa For the sake of clarity, you are agreeing that we should expand the contract of ignored_modules to include import-errors of sub-packages?

I can probably work this up this weekend.
Afterwards, I would move to add six.moves,py,distutils to the default list.

[pylint-bot]

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

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Yes, sorry if I'm unclear.

[pylint-bot]

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

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Fix issue #223 (ignored_modules should apply to import errors too). The fix will ignore import errors caused by attempting to import any name which is or is a subpackage of a module listed in ignored_modules.

[pylint-bot]

Original comment by Ivan Smirnov (BitBucket: aldanor, GitHub: @aldanor?):

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@PCManticore Is setting ignore-modules supposed to get rid of import-error?

I was getting this kind of errors:

E:  7, 0: No name 'path' in module 'py' (no-name-in-module)
F:  7, 0: Unable to import 'py.path' (import-error)
F: 10, 0: Unable to import 'six.moves' (import-error)
E: 17,15: Module 'py' has no 'path' member (no-member)
E: 20,15: Module 'py' has no 'path' member (no-member)
E: 64,23: Module 'py' has no 'path' member (no-member)
E: 66,17: Module 'py' has no 'path' member (no-member)

Then I've put six and py in ignored-modules:

ignored-modules=py,py.path,six,six.moves

Which seemed to get rid of no-member but not import-error:

F:  7, 0: Unable to import 'py.path' (import-error)
F: 10, 0: Unable to import 'six.moves' (import-error)

Is this intended behaviour or a bug? (astroid 1.3.6, pylint 1.4.4)