[PyQt] Issue with multiple inheritance

Dmitry Shachnev mitya57 at ubuntu.com
Fri Jan 20 20:43:10 GMT 2017

Hi all,

I am trying to write a class that inherits from two parent classes: one from
Qt and one mine.

The minimal example is:

from PyQt5.QtCore import QObject

class AnotherBase:
    def __init__(self, foo):

class MyView(QObject, AnotherBase):
    def __init__(self, foo):


When I try to run it (with the latest sip and PyQt releases), I get this:

Traceback (most recent call last):
  File "./test.py", line 11, in <module>
  File "./test.py", line 9, in __init__
TypeError: __init__() missing 1 required positional argument: 'foo'

Which sounds strange to me. Why should QObject.__init__ take my argument?

This does not happen when I replace QObject with my own another base class.
This also does not happen if I change the order of inheritance: first
AnotherBase, then QObject.

Is it my misunderstanding or a bug somewhere? (I hope for the former.)

Dmitry Shachnev
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