Pylint: The duplicate-code (R0801) can't be disabled

[pylint-bot]

Originally reported by: Anonymous

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It's seems like it's not possible to disable the duplicate code check on portions of a file. Looking at the source, I can see why as it's not a trivial thing to do (if you want to maintain the same scope semantics as other #pylint:enable/disable comments. This would be nice to have though (or I guess I could just cleanup my duplicate code).

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• Bitbucket: https://bitbucket.org/logilab/pylint/issue/214

[pylint-bot]

_Original comment by_ Radek Holý (BitBucket: PyDeq, GitHub: @PyDeq?):

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Pylint marks even import blocks as duplicates. In my case, it is:

#!python
import contextlib
import io
import itertools
import os
import subprocess
import tempfile

I doubt it is possible to clean up/refactor the code to prevent this, thus it would be nice if it would ignore imports or if it would be possible to use the disable comment.

[pylint-bot]

_Original comment by_ Buck Evan (BitBucket: bukzor, GitHub: @bukzor?):

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I've run into this today.

My project has several setup.py files, which of course look quite similar, but can't really share code.
I tried to # pylint:disable=duplicate-code just the line in question (setup()), but it did nothing.

I'll have to turn the checker off entirely I think.

[gaspaio]

any news on this issue ?

[PCManticore]

No one is currently working on this. This would be nice to have fixed, but unfortunately I didn't have time to look into it. A pull request would be appreciated though and would definitely move it forward.

[moylop260]

@gaspaio
FYI I have created a fix in the following PR https://github.com/PyCQA/pylint/pull/1055
Could you check if It work for you?

[YifeiZuo01]

Is this related to duplicate-except? it cannot be disabled either.

sorry, Seems it is able to be disabled.

[furkanmustafa]

@PCManticore as you mentioned, there is probably no good way to fix this issue for this version; What about fixing this in a "bad way" for this version, and later on in the planned version 3 you can utilize a better engineered two-phase design ?

While sailing, sometimes the only way to fix your ship is ugly patching, and it's better than not fixing.
A functioning tool is absolutely better than a "perfectly engineered" tool.

[bukzor]

A functioning tool is absolutely better than a "perfectly engineered" tool.

It's better because it exists, unlike perfect engineering :D

[levsa]

Is this issue resolved? I'm using pylint 2.1.1 and cannot seem to disable the warning with comments in the files which are printed in the warning.

[moylop260]

Hi @levsa
I have created a custom patch that you can use locally from:

• https://github.com/PyCQA/pylint/pull/1055#issuecomment-384382126

We are using it 2.5 years ago and it is working fine.

The main issue is that the state_lines are not propagated for the methods used.
This patch just propagates them correctly.

[moylop260]

You can use:

wget -q https://raw.githubusercontent.com/Vauxoo/pylint-conf/master/conf/pylint_pr1055.patch -O pylint_pr1055.patch
patch -f -p0 $(python -c "from __future__ import print_function; from pylint.checkers import similar; print(similar.__file__.rstrip('c'))") -i pylint_pr1055.patch

[filips123]

@moylop260 Your fix doesn't work. Even if I have # pylint: disable=duplicate-code in each file with duplicate code, I still get errors.

[moylop260]

You have duplicated comments too.
Check answer https://github.com/PyCQA/pylint/pull/1055#issuecomment-470572805

[vlad0337187]

Still have this issue on pylint = "==2.3.1"

[cybertk]

The issue still there for latest python 2 pylint version 1.9.4

# pylint: disable=duplicate-code does not work, while # pylint: disable=all` can disable the dup check.

[fechnert]

Also have this issue with pylint==2.3.1

Even if i add the the pragma in every file with duplicate code like @filips123, i still get the files with the pragma reported ....

Any progress on this? I don't want to # pylint: disable=all for all affected files ...

[adaviding]

I am using pylint 2.4.0 for python 3 and I can see that disable=duplicate-code is working.

[MarcSkovMadsen]

I'm using pylint 2.4.4 and # pylint: disable=duplicate-code is not working for me.

[cochiseruhulessin]

Also on 2.4.4

[jaoxford]

And on 2.4.2

[doctorcolossus]

another confirmation of this issue on 2.4.4

[back-4peck]

Not working for me # pylint: disable=duplicate-code at 2.4.4 version python 3.8

[kentenzer]

Also not woking at 2.4.4 with python 3.7.4 and # pylint: disable=R0801 or # pylint: disable=duplicate-code

[ashep]

Also doesn't work. pylint 2.4.4, astroid 2.3.3, Python 3.8.2

[BingLingGroup]

I found a solution to partially solve this.

https://github.com/PyCQA/pylint/pull/1055#issuecomment-477253153

Use pylintrc. Try changing the min-similarity-lines in the similarities section of your pylintrc config file.

[SIMILARITIES]

# Minimum lines number of a similarity.
min-similarity-lines=4

# Ignore comments when computing similarities.
ignore-comments=yes

# Ignore docstrings when computing similarities.
ignore-docstrings=yes

# Ignore imports when computing similarities.
ignore-imports=no

[zuckerruebe]

+1

[JulienPalard]

Happened to me on a overloaded method declaration, which is obviously identical as its parent class, and in my case its sister class, so pylint reports "Similar lines in 3 files" with the def and its 4 arguments (spanning on 6 lines, I have one argument per line due to type anotations).

It think this could be mitigated by whitelisting import statements and method declaration.

[rjeffman]

Just been bitten by this issue today.

pylint 2.6.0
astroid 2.4.2
Python 3.9.1 (default, Jan 20 2021, 00:00:00)

Increasing min-similarity-lines is not actually a solution, as it will turn off duplicate code evaluation.

[aneuway2]

In my particular case I had two separate classes with similar inputs in the def __init__

As a workaround and what worked for me was to include the following in our pyproject.toml (which is the SIMILARITIES section if you use pylinr.rc):

[tool.pylint.SIMULARITIES]
ignore-comments = "no"

Doing this then allows pylint to not disregard the comments on lines. From there we added the # pylint: disable=duplicate-code to the end of one of the lines which now made this "unique" (although you could in practice use any comment text)

This is a better temporary workaround than the min-similarity-lines option as that:

• misses other instance where you'd want that check
• also doesnt return with a valid exit code even though rating is 10.00/10