Re: A question about Python Classes

From	"Pascal J. Bourguignon" <pjb@informatimago.com>
Newsgroups	comp.lang.python, comp.programming
Subject	Re: A question about Python Classes
Date	2011-04-21 19:12 +0200
Organization	Informatimago
Message-ID	<87k4enil5g.fsf@kuiper.lan.informatimago.com> (permalink)
References	<2219ee53-e8aa-4ac4-839f-014c3d1b1914@a19g2000prj.googlegroups.com>

Cross-posted to 2 groups.

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chad <cdalten@gmail.com> writes:

> Let's say I have the following....
>
> class BaseHandler:
>     def foo(self):
>         print "Hello"
>
> class HomeHandler(BaseHandler):
>     pass
>
>
> Then I do the following...
>
> test = HomeHandler()
> test.foo()
>
> How can HomeHandler call foo() when I never created an instance of
> BaseHandler?

But you created one!

test is an instance of HomeHandler, which is a subclass of BaseHandler,
so test is also an instance of BaseHandler.

A subclass represents a subset of the instances of its super class.

-- 
__Pascal Bourguignon__                     http://www.informatimago.com/
A bad day in () is better than a good day in {}.

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Thread

A question about Python Classes chad <cdalten@gmail.com> - 2011-04-21 08:43 -0700
  Re: A question about Python Classes Jean-Michel Pichavant <jeanmichel@sequans.com> - 2011-04-21 18:30 +0200
    Re: A question about Python Classes chad <cdalten@gmail.com> - 2011-04-21 09:46 -0700
  Re: A question about Python Classes "Pascal J. Bourguignon" <pjb@informatimago.com> - 2011-04-21 19:12 +0200
    Re: A question about Python Classes MRAB <python@mrabarnett.plus.com> - 2011-04-21 19:00 +0100
      Re: A question about Python Classes Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-04-22 01:53 +0000
    Re: A question about Python Classes Jean-Michel Pichavant <jeanmichel@sequans.com> - 2011-04-22 11:47 +0200
  Re: A question about Python Classes Terry Reedy <tjreedy@udel.edu> - 2011-04-21 13:39 -0400
  Re: A question about Python Classes Ethan Furman <ethan@stoneleaf.us> - 2011-04-21 11:34 -0700
    Re: A question about Python Classes "Kyle T. Jones" <onexpadREMOVE@EVOMERyahoodotyouknow.com> - 2011-04-22 08:49 -0500
      Re: A question about Python Classes Ethan Furman <ethan@stoneleaf.us> - 2011-04-22 12:38 -0700
      Re: A question about Python Classes Ian Kelly <ian.g.kelly@gmail.com> - 2011-04-22 13:40 -0600

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