[PyQt] Incompotible signatures

[Hans-Peter Jansen]

On Wednesday 20 October 2010, 12:23:36 Alexandr N Zamaraev wrote:
> I upgrade my Kubuntu to 10.10.
> (libqtcore4 v4.7.0-0ubuntu4, python-sip v4.10.5-0ubuntu1, python-qt4
> v4.7.4-0ubuntu1)
> And I receive TypeError for my projects
>
> Sample code (file slots.py):
> #! /usr/bin/env python
> # -*- coding: utf-8 -*-
>
> import sys
> from PyQt4 import QtCore, QtGui
>
> class TableView(QtGui.QTableView):
>   def __init__(self):
>     super(TableView, self).__init__()
>     self.doubleClicked.connect(self.noSlot)
>     self.doubleClicked.connect(self.cppSlot)
>     self.doubleClicked.connect(self.pySlot)
>
>   def noSlot(self, index):
>     pass
>
>   @QtCore.pyqtSlot('const QModelIndex&')
>   def cppSlot(self, index):
>     pass
>
>   @QtCore.pyqtSlot(QtCore.QModelIndex)
>   def pySlot(self, index):
>     pass
>
> def main():
>   app = QtGui.QApplication(sys.argv)
>   TableView()
>
> if __name__ == '__main__':
>   main()
>
> Console session:
> $ ./slots.py
> Traceback (most recent call last):
>   File "./slots.py", line 30, in <module>
>     main()
>   File "./slots.py", line 27, in main
>     TableView()
>   File "./slots.py", line 12, in __init__
>     self.doubleClicked.connect(self.pySlot)
> TypeError: pySlot() has no overload that is compatible with
> doubleClicked(QModelIndex)

FWIW, it does not traceback with current sip/PyQt (snapshots) at least.
There an optional signal dict key argument, that might help you to work 
around the issue. See the Bar class in:

http://www.riverbankcomputing.com/static/Docs/PyQt4/pyqt4ref.html#connecting-disconnecting-and-emitting-signals

Hth,
Pete