[PyQt] Fwd: Mixin classes and PyQt4
bazwal at ftml.net
Wed Feb 12 21:55:12 GMT 2014
On 12/02/14 09:35, Martin Teichmann wrote:
> Hi Phil, Hi Baz, Hi List,
> I just wrote a patch as advertised earlier, which checks that the
> inheritance is correct and that noone attempts to inherit from more
> than one PyQt base class. It is based on the patch sent earlier.
> Maybe this is an improvement enough to put my patches in?
This actually only relates to multiple-inheritance. It should never be
problem for true mixin classes.
The one genuine issue with mixins in PyQt, is that you cannot inherit
In PySide, I can do this:
>>> from PySide import QtCore, QtGui
>>> app = QtGui.QApplication()
>>> class A(object):
... sig = QtCore.Signal(int)
>>> class B(A, QtGui.QLabel):
... def __init__(self):
... super(B, self).__init__()
... def foo(self): self.sig.emit(42)
... def bar(self, i): print(i)
>>> b = B()
I understand that Qt itself doesn't allow this, but is there a technical
reason why this is not possible in PyQt? There is a real, practical need
for this functionality (code reuse), and its galling that PySide allows
it but PyQt doesn't.
More information about the PyQt