Plugin triggers False positive unsupported-assignment-operation

[jorisvr]

It looks like this plugin triggers false positive errors:

E1137: 'self.my_array' does not support item assignment (unsupported-assignment-operation)

This error occurs when running pylint --load-plugin=pylint_qt on the following code:

import PySide6.QtCore

class MyClass:

    def __init__(self) -> None:
        self.my_array = [1, 2, 3, 4]
        self.my_array[1] = 5

The error only appears when passing --load-plugin=pylint_qt and importing a PySide6 module. This suggests to me that the plugin somehow triggers the error, but I don't yet understand how it happens.

Using Python 3.13.9, packages:

Package            Version
------------------ -------
astroid            4.0.4
colorama           0.4.6
dill               0.4.1
isort              8.0.1
mccabe             0.7.0
pip                25.2
platformdirs       4.9.6
pylint             4.0.5
pylint-qt          0.1.0
PySide6            6.11.0
PySide6_Addons     6.11.0
PySide6_Essentials 6.11.0
shiboken6          6.11.0
tomlkit            0.14.0

[jorisvr]

pylint_qt_issue2.py

[owillebo]

Perhaps this is related.

"""pylint_qt triggers another warning."""
import PySide6.QtCore

class SomeClass:  # pylint: disable=too-few-public-methods
    """Some docstring."""

    def __init__(self):
        self.__timers = []
        self.__timers.append(PySide6.QtCore.QTimer())
        self.__timers[-1].timeout.connect(lambda:None)

RMDIR /S /Q .venv
ERASE test*.py
python -m venv .venv
CALL .venv\Scripts\activate
python -m pip install pylint PySide6 pylint_qt
python -m pip freeze
pylint --version
(
    ECHO """astroid-4.0.0 does not resolve PySide6.QtCore.QTimer::timeout.connect."""
    ECHO import PySide6.QtCore
    ECHO(
    ECHO timer = PySide6.QtCore.QTimer(^)
    ECHO timer.timeout.connect(lambda:None^)
) > test_fixed.py
REM ~ Initial issue solved!
pylint --load-plugins=pylint_qt --extension-pkg-allow-list=PySide6.QtCore test_fixed.py
(
    ECHO """pylint_qt triggers another warning."""
    ECHO import PySide6.QtCore
    ECHO(
    ECHO class SomeClass:  # pylint: disable=too-few-public-methods
    ECHO     """Some docstring."""
    ECHO(
    ECHO     def __init__(self^):
    ECHO         self.__timers = []
    ECHO         self.__timers.append(PySide6.QtCore.QTimer(^)^)
    ECHO         self.__timers[-1].timeout.connect(lambda:None^)
) > test.py
REM ~ If timer is added to list we still get warnings.
pylint --load-plugins=pylint_qt --extension-pkg-allow-list=PySide6.QtCore test.py

gives

C:\Temp\astroid>RMDIR /S /Q .venv 

C:\Temp\astroid>ERASE test*.py 

C:\Temp\astroid>python -m venv .venv 

C:\Temp\astroid>CALL .venv\Scripts\activate 
Collecting pylint
  Using cached pylint-4.0.5-py3-none-any.whl.metadata (12 kB)
Collecting PySide6
  Using cached pyside6-6.11.0-cp310-abi3-win_amd64.whl.metadata (5.5 kB)
Collecting pylint_qt
  Using cached pylint_qt-0.1.0-py3-none-any.whl.metadata (2.7 kB)
Collecting astroid<=4.1.dev0,>=4.0.2 (from pylint)
  Using cached astroid-4.0.4-py3-none-any.whl.metadata (4.4 kB)
Collecting colorama>=0.4.5 (from pylint)
  Using cached colorama-0.4.6-py2.py3-none-any.whl.metadata (17 kB)
Collecting dill>=0.3.6 (from pylint)
  Using cached dill-0.4.1-py3-none-any.whl.metadata (10 kB)
Collecting isort!=5.13,<9,>=5 (from pylint)
  Using cached isort-8.0.1-py3-none-any.whl.metadata (11 kB)
Collecting mccabe<0.8,>=0.6 (from pylint)
  Using cached mccabe-0.7.0-py2.py3-none-any.whl.metadata (5.0 kB)
Collecting platformdirs>=2.2 (from pylint)
  Using cached platformdirs-4.9.6-py3-none-any.whl.metadata (4.7 kB)
Collecting tomlkit>=0.10.1 (from pylint)
  Using cached tomlkit-0.14.0-py3-none-any.whl.metadata (2.8 kB)
Collecting shiboken6==6.11.0 (from PySide6)
  Using cached shiboken6-6.11.0-cp310-abi3-win_amd64.whl.metadata (2.5 kB)
Collecting PySide6_Essentials==6.11.0 (from PySide6)
  Using cached pyside6_essentials-6.11.0-cp310-abi3-win_amd64.whl.metadata (3.8 kB)
Collecting PySide6_Addons==6.11.0 (from PySide6)
  Using cached pyside6_addons-6.11.0-cp310-abi3-win_amd64.whl.metadata (4.2 kB)
Using cached pylint-4.0.5-py3-none-any.whl (536 kB)
Using cached astroid-4.0.4-py3-none-any.whl (276 kB)
Using cached isort-8.0.1-py3-none-any.whl (89 kB)
Using cached mccabe-0.7.0-py2.py3-none-any.whl (7.3 kB)
Using cached pyside6-6.11.0-cp310-abi3-win_amd64.whl (577 kB)
Using cached pyside6_addons-6.11.0-cp310-abi3-win_amd64.whl (168.7 MB)
Using cached pyside6_essentials-6.11.0-cp310-abi3-win_amd64.whl (75.8 MB)
Using cached shiboken6-6.11.0-cp310-abi3-win_amd64.whl (1.2 MB)
Using cached pylint_qt-0.1.0-py3-none-any.whl (7.1 kB)
Using cached colorama-0.4.6-py2.py3-none-any.whl (25 kB)
Using cached dill-0.4.1-py3-none-any.whl (120 kB)
Using cached platformdirs-4.9.6-py3-none-any.whl (21 kB)
Using cached tomlkit-0.14.0-py3-none-any.whl (39 kB)
Installing collected packages: tomlkit, shiboken6, platformdirs, mccabe, isort, dill, colorama, astroid, PySide6_Essentials, pylint, PySide6_Addons, pylint_qt, PySide6

Successfully installed PySide6-6.11.0 PySide6_Addons-6.11.0 PySide6_Essentials-6.11.0 astroid-4.0.4 colorama-0.4.6 dill-0.4.1 isort-8.0.1 mccabe-0.7.0 platformdirs-4.9.6 pylint-4.0.5 pylint_qt-0.1.0 shiboken6-6.11.0 tomlkit-0.14.0
astroid==4.0.4
colorama==0.4.6
dill==0.4.1
isort==8.0.1
mccabe==0.7.0
platformdirs==4.9.6
pylint==4.0.5
pylint-qt==0.1.0
PySide6==6.11.0
PySide6_Addons==6.11.0
PySide6_Essentials==6.11.0
shiboken6==6.11.0
tomlkit==0.14.0
pylint 4.0.5
astroid 4.0.4
Python 3.14.4 (tags/v3.14.4:23116f9, Apr  7 2026, 14:10:54) [MSC v.1944 64 bit (AMD64)]

--------------------------------------------------------------------
Your code has been rated at 10.00/10 (previous run: 10.00/10, +0.00)

************* Module test
test.py:10:8: E1101: Instance of '_PySideSignalTemplate' has no 'timeout' member (no-member)

------------------------------------------------------------------
Your code has been rated at 1.67/10 (previous run: 1.67/10, +0.00)