Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.python > #21524

Re: newb __init__ inheritance

Show all headers | View raw

On Thursday, March 8, 2012 5:25:06 PM UTC+2, hyperboogie wrote:
> Hello everyone.
> 
> This is my first post in this group.
> I started learning python a week ago from the "dive into python" e-
> book and thus far all was clear.
> However today while reading chapter 5 about objects and object
> orientation I ran into something that confused me.
> it says here:
> http://www.diveintopython.net/object_oriented_framework/defining_classes.html#fileinfo.class.example
> 
> "__init__ methods are optional, but when you define one, you must
> remember to explicitly call the ancestor's __init__ method (if it
> defines one). This is more generally true: whenever a descendant wants
> to extend the behavior of the ancestor, the descendant method must
> explicitly call the ancestor method at the proper time, with the
> proper arguments. "
> 
> However later on in the chapter:
> http://www.diveintopython.net/object_oriented_framework/userdict.html
> 
> it says:
> "Methods are defined solely by their name, and there can be only one
> method per class with a given name. So if a descendant class has an
> __init__ method, it always overrides the ancestor __init__ method,
> even if the descendant defines it with a different argument list. And
> the same rule applies to any other method. "
> 
> My question is if __init__ in the descendant class overrides __init__
> in the parent class how can I call the parent's __init__ from the
> descendant class - I just overrode it didn't I?
> 
> Am I missing something more fundamental here?
> Thanks

Thank you so much everyone for you help. No doubt I still have a long way to go before I feel comfortable with python.
Appreciate all your help...

Back to comp.lang.python | Previous | Next — Previous in thread | Find similar | Unroll thread

Thread

newb __init__ inheritance hyperboogie <hyperboogie@gmail.com> - 2012-03-08 07:25 -0800
  Re: newb __init__ inheritance Maarten <maarten.sneep@knmi.nl> - 2012-03-08 08:30 -0800
    Re: newb __init__ inheritance Peter Otten <__peter__@web.de> - 2012-03-08 18:03 +0100
  Re: newb __init__ inheritance Ethan Furman <ethan@stoneleaf.us> - 2012-03-08 09:34 -0800
  Re: newb __init__ inheritance "Colin J. Williams" <cjw@ncf.ca> - 2012-03-10 12:58 -0500
    Re: newb __init__ inheritance "Colin J. Williams" <cjw@ncf.ca> - 2012-03-10 17:47 -0500
      Re: newb __init__ inheritance hyperboogie <hyperboogie@gmail.com> - 2012-03-11 03:18 -0700
        Re: newb __init__ inheritance Chris Rebert <clp2@rebertia.com> - 2012-03-11 03:38 -0700
          Re: newb __init__ inheritance hyperboogie <hyperboogie@gmail.com> - 2012-03-11 03:56 -0700
            Re: newb __init__ inheritance Chris Rebert <clp2@rebertia.com> - 2012-03-11 04:37 -0700
            Re: newb __init__ inheritance Ian Kelly <ian.g.kelly@gmail.com> - 2012-03-11 05:40 -0600
            Re: newb __init__ inheritance Ian Kelly <ian.g.kelly@gmail.com> - 2012-03-11 05:52 -0600
            Re: newb __init__ inheritance Peter Otten <__peter__@web.de> - 2012-03-11 13:12 +0100
          Re: newb __init__ inheritance hyperboogie <hyperboogie@gmail.com> - 2012-03-11 03:56 -0700
  Re: newb __init__ inheritance hyperboogie <hyperboogie@gmail.com> - 2012-03-12 02:09 -0700

csiph-web