Generated warnings depending on file arguments order

[pylint-bot]

Originally reported by: Anonymous

---

I'm using pylint as part of an automated commit hook in git to check if any file that was changed is non-conformant. My git-hook looks something like:

#!bash

pylint --rcfile=my_pylint_config_file.cfg --reports=no ${PY_FILES_CHANGED[@]} 2>&1

Here, the bash array ${PY_FILES_CHANGED} is populated with the filenames of python files based on the files in the current commit. Today I ran into a strange error. My commit consisted of 2 files in the same directory (package) -- though I'm not sure if pylint cares about that.

#!python

$ pylint --reports=no package/foo.py package/bar.py 
************* Module package.bar
C: 83, 4: Invalid attribute name "id" (invalid-name)
************* Module package.foo
R: 18, 0: Too many instance attributes (8/7) (too-many-instance-attributes)
$ 
$ pylint --reports=no package/bar.py package/foo.py
$

Is this expected behavior?

---

• Bitbucket: https://bitbucket.org/logilab/pylint/issue/689

[pylint-bot]

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

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No, this is not expected, it's probably a bug. Could you provide your config file and some files which reproduces the issue for you? I tried with some dummy files, but I always get the same output.

[pylint-bot]

Original comment by Matt Gilson (BitBucket: mgilson1):

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I'm trying to reproduce this one simply (outside of my source tree), but I'm having a bit of trouble. It seems that there's something going on with my packages and subpackages in our project. I'll keep trying to distill it down to a minimal amount of code that I can pass on. (I unfortunately can't post my actual code at the moment as it is proprietary).

If I can't distill it, I guess you'll have to close this one as "Not Reproducible", but maybe another use will find this in a google search with a code sample that can reproduce this one.

[pylint-bot]

Original comment by Matt Gilson (BitBucket: mgilson1):

---

To reproduce, unpack the tarball, then:

#!bash
cd /path/to/unpacked/tarball/pylint-bug2
pylint --report=no --rcfile=pylint_config services/email/{models,gmail}.py
pylint --report=no --rcfile=pylint_config services/email/{gmail,models}.py

[pylint-bot]

Original comment by Matt Gilson (BitBucket: mgilson1):

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And if it matters, here's my pylint version/build info:

#!bash


$ pylint --version
No config file found, using default configuration
pylint 1.4.4, 
astroid 1.3.6, common 1.0.1
Python 2.7.6 (default, Sep  9 2014, 15:04:36) 
[GCC 4.2.1 Compatible Apple LLVM 6.0 (clang-600.0.39)]

[funous]

The issue is still present. I am able to reproduce it using the files in the attached archive (mymodule.zip).

Steps to reproduce:

1. download the archive
2. unzip mymodule.zip
3. cd mymodule
4. pylint mybase.py override.py Output:

No config file found, using default configuration
************* Module mymodule.mybase
C:  5, 0: Missing class docstring (missing-docstring)
R:  5, 0: Too few public methods (1/2) (too-few-public-methods)
************* Module mymodule.override
C:  5, 0: Missing function docstring (missing-docstring)
C:  6, 4: Black listed name "foo" (blacklisted-name)

------------------------------------------------------------------
Your code has been rated at 4.29/10 (previous run: 4.29/10, +0.00)

5. pylint override.py mybase.py Output:

No config file found, using default configuration
************* Module mymodule.override
C:  5, 0: Missing function docstring (missing-docstring)
C:  6, 4: Black listed name "foo" (blacklisted-name)
C:  7, 4: Attribute name "myInvalidName" doesn't conform to snake_case naming style (invalid-name)
************* Module mymodule.mybase
C:  5, 0: Missing class docstring (missing-docstring)
R:  5, 0: Too few public methods (1/2) (too-few-public-methods)

------------------------------------------------------------------
Your code has been rated at 2.86/10 (previous run: 2.86/10, +0.00)

Expected behaviour: Identical output in steps 4. anf 5., as they only differ in the file order. Notice the extra Attribute name "myInvalidName" doesn't conform to snake_case naming style (invalid-name).

Pylint version:

pylint --version
No config file found, using default configuration
pylint 1.8.1, 
astroid 1.6.0
Python 3.5.2 (default, Nov 23 2017, 16:37:01) 
[GCC 5.4.0 20160609]

I've observed this to happen only if imports are using the import mymodule.<file> style, not when they use import <file> directly. Note that thirdparty.py demonstrates a third-party module in my case, which doesn't conform to the preferred coding style, which is where the invalid-name comes from. I was able to reproduce it on a more-recent pylint/python as well in docker:

pylint 1.8.4, 
astroid 1.6.3
Python 3.6.5 (default, Mar 31 2018, 01:15:58) 
[GCC 4.9.2]

I have also seen this with the Too many instance attributes error, but I don't have a good small test-case for that.

[Pycz]

Have the same issue.

[stefanistrate]

I have the same issue with:

$ pylint --version
pylint 2.9.5
astroid 2.6.5
Python 3.9.6 (default, Jun 29 2021,
[Clang 12.0.5 (clang-1205.0.22.9)]

[asadovsky]

Very simple repro:

a.py:

"""Defines A."""


class A:
    def foo(self, x):
        pass

b.py:

"""Defines B."""

from a import A


class B(A):
    def foo(self, x):
        return 0

Run this in your shell:

$ pylint b.py a.py
************* Module b
b.py:7:18: W0613: Unused argument 'x' (unused-argument)

-----------------------------------
Your code has been rated at 8.57/10

$ pylint a.py b.py

------------------------------------
Your code has been rated at 10.00/10

[mbyrnepr2]

What I am seeing is based on this example from the comments & it looks like the original reported issue is no longer an issue but something else is now occurring in the output formatting.

The emitted messages are the same but they end up outputted in a different section in the report:

(venv310) Marks-MacBook-Air-2:mymodule markbyrne$ pylint mybase.py override.py 
************* Module mymodule.mybase
mybase.py:5:0: C0115: Missing class docstring (missing-class-docstring)
************* Module mymodule.override
override.py:7:4: C0103: Attribute name "myInvalidName" doesn't conform to snake_case naming style (invalid-name)
mybase.py:5:0: R0903: Too few public methods (1/2) (too-few-public-methods)
override.py:5:0: C0116: Missing function or method docstring (missing-function-docstring)
override.py:6:4: C0104: Disallowed name "foo" (disallowed-name)

------------------------------------------------------------------
Your code has been rated at 2.86/10 (previous run: 2.86/10, +0.00)

(venv310) Marks-MacBook-Air-2:mymodule markbyrne$ pylint override.py mybase.py 
************* Module mymodule.override
override.py:5:0: C0116: Missing function or method docstring (missing-function-docstring)
override.py:6:4: C0104: Disallowed name "foo" (disallowed-name)
************* Module mymodule.mybase
mybase.py:5:0: C0115: Missing class docstring (missing-class-docstring)
override.py:7:4: C0103: Attribute name "myInvalidName" doesn't conform to snake_case naming style (invalid-name)
mybase.py:5:0: R0903: Too few public methods (1/2) (too-few-public-methods)

------------------------------------------------------------------
Your code has been rated at 2.86/10 (previous run: 2.86/10, +0.00)