[PyQt] multiple inheritance and signals problem, mixin before QObject

[lloyd konneker]

This is an update to my previous post.
Here is an abstract of the code for easier reading:


class B(object):
   def __init__(self):
     self.a1 = A()
     self.a1.signal1.connect(self.handler)    # Fails in PyQt, succeeds 
in PySide

   def handler(self):
     pass


class A (Mixin, SubclassOfQObject):
   def __init__(self):
     super().__init__()

class Mixin(object):
   signal1 = Signal()
   def __init__(self):
     super().__init__()



Again, AFAIK this works in PySide, but not in PyQt.
The MRO of a1, an instance of class A, is (Mixin, SubclassOfQObject, 
QObject, object).
And Mixin.__init__ calls super, which calls QObject.__init__ for 
instance a1,
so the signal instance should be bound by the time its connect method is 
called?

I found that a workaround is to eliminate the mixin:


class A (SubclassOfQObject):
   signal1 = Signal()
   def __init__(self):
     super().__init__()

   ... methods that were in Mixin ...


I just don't understand why.  Should I submit an executable test case?