advice on programming style: is multiple inheritance bad?
Uwe Mayer
merkosh at hadiko.de
Tue Feb 3 09:57:24 EST 2004
Michael Hudson wrote:
> Uwe Mayer <merkosh at hadiko.de> writes:
>
>> BTW: when doing m.i. you can't mix new-style and old-style objects, or
>> else Python exits with a Segmentation Fault. :)
>
> Uhh, really? Example please.
Seems only to occur in connection with Qt. :(
Code as the one below, inheriting from some Qt Widget and using m.i. with
new-style classes cause a Segmentation Fault on my machine:
-- example --
from qt import QWidget, QApplication
import sys
class A:
def __init__(self):
print "in A"
class B(object):
def __init__(self):
print "in B"
class C(QWidget,A):
def __init__(self):
QWidget.__init__(self)
A.__init__(self)
print "in C"
class D(QWidget,B):
def __init__(self):
QWidget.__init__(self)
B.__init__(self)
app = QApplication(sys.argv)
C() #works
D() #fails
-- example --
Ciao
Uwe
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