Unfortunately, the stubs provided by default the pyside6 package are both incorrect and incomplete. But there is hope...

I have just released the pyside6-stubs package which provides noticeable improvements over the default stubs. For example :

• add all missing signals to the stubs (many were missing)
• fix QFileDialog.getOpen*() methods to accept None as parent argument
• support all QSize and QSizeF operations
• fix QTreeWidgetItem comparison with <
• fix qVersion() returns string, not bytes
• fix qDebug(), qWarning(), qCritical(), qFatal(), SIGNAL(), SLOT() to accept string, not bytes

And many more...

To benefit from this, install the pip package : https://pypi.org/project/PySide6-stubs/

To help improve the stubs or report any bug, it's here : https://github.com/python-qt-tools/PySide6-stubs