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Details

Type: Bug
Resolution: Fixed
Priority: P4: Low
Fix Version/s: 6.8.0, 6.7.1
Affects Version/s: 6.7.0
Component/s: PySide
Labels:
None
Environment:
Windows 11 23H2

Platform/s:

Windows
Commits:
c97b67f01 (dev), 7304b26c2 (6.7)

Description

This tickets arose out of https://github.com/pytest-dev/pytest-qt/issues/552.

There is a number of issues new in 6.7.0 revolving around warnings when disconnecting signals.

1. This code prints warnings that cannot be suppressed in Python:

import warnings
from PySide6.QtCore import Signal
from PySide6.QtWidgets import QApplication, QMainWindow

warnings.filterwarnings('ignore')

class Window(QMainWindow):
    signal = Signal()

    def __init__(self):
        super().__init__()
        self.signal.connect(self.Slot)
        self.signal.disconnect(self.Slot)
        self.signal.disconnect(self.Slot)

    def Slot(self): ...

warnings.warn(Warning("some warning"))
app = QApplication()
window = Window()
print("Done")

2. This code shows that the warnings appear somewhat inconsistently. Run this code several times, and you will see the warning 1 or 2 times. If you see it only once, increase "10"; if you see it only twice, decrease "10":

from PySide6.QtCore import QTimer
from PySide6.QtWidgets import QApplication

class MyClass:
    def __init__(self):
        self.timer = QTimer()
        self.timer.timeout.disconnect(self.empty)

    def empty(self): ...

app = QApplication()
for _ in range(10):
    MyClass()

3. This code shows that the warnings appears depending on whether the reference to the MyClass object is stored in a variable or not:

from PySide6.QtCore import QTimer
from PySide6.QtWidgets import QApplication, QWidget

class MyClass:
    def __init__(self, signal):
        self.timer = QTimer()
        signal.connect(self.cleanup)

    def cleanup(self):
        self.timer.timeout.disconnect(self.cleanup)

app = QApplication()
widget = QWidget()
signal = widget.windowTitleChanged

print("- no warning:")
MyClass(signal)
signal.emit("")

print("- warning:")
_class = MyClass(signal)
signal.emit("")