Carl Banks ha scritto: > Pupeno wrote: > > I see, thank you. > > > > class MyConfig(ConfigParser, object): > > def add_section(self, section) > > super(MyConfig, self).add_section(section) > > > > seems to work and as expected. Is there anything wrong with it ? > > Wow. > > I highly recommend not doing this, unless the new type system was > designed to allow this sort of mixing, which I highly doubt. There are > some significant under-the-cover differences between old- and new-style > classes that could mess everything up when trying to mix them. >
I believe the new style system was designed to allows this sort of mixing and that there are no issues at all. A child of new style + old style is simply a new style class. If you do class NewStyle(OldStyle, object): pass you will see that type(NewStyle) == type There should be something more on http://www.python.org/download/releases/2.2.3/descrintro (I have seen somewhere how type.__new__ works, and how the metaclass is chosen, so I am pretty sure sure there are no issue, at least for pure Python classes). Michele Simionato -- http://mail.python.org/mailman/listinfo/python-list
