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Groups > comp.lang.python > #83765

Re: Calling a derived class's constructor from a parent method

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On Wed, Jan 14, 2015 at 9:45 AM, jason <jasonsewall@gmail.com> wrote:
> class A(object):
>       def __init__(self, s):
>             self.s = s
>       def foo(self, s):
>             return A(s)

Instead of explicitly naming the return class here, do this:

    return self.__class__(s)

Alternatively, since you never use self elsewhere in the method, it
may be cleaner to use a classmethod here:

    @classmethod
    def foo(cls, s):
        return cls(s)

> I'm using Python 2.7.5, but I'm curious what the 3.x answer is too.

The answer is the same in 3.x.

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Thread

Calling a derived class's constructor from a parent method jason <jasonsewall@gmail.com> - 2015-01-14 08:45 -0800
  Re: Calling a derived class's constructor from a parent method Ian Kelly <ian.g.kelly@gmail.com> - 2015-01-14 10:00 -0700
  Re: Calling a derived class's constructor from a parent method Chris Angelico <rosuav@gmail.com> - 2015-01-15 03:56 +1100
  Re: Calling a derived class's constructor from a parent method Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-01-14 17:05 +0000
    Re: Calling a derived class's constructor from a parent method jason <jasonsewall@gmail.com> - 2015-01-14 10:10 -0800
      Re: Calling a derived class's constructor from a parent method Dave Angel <davea@davea.name> - 2015-01-14 13:41 -0500
    Re: Calling a derived class's constructor from a parent method alister <alister.nospam.ware@ntlworld.com> - 2015-01-14 18:18 +0000
  Re: Calling a derived class's constructor from a parent method Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-01-15 11:40 +1100
    Re: Calling a derived class's constructor from a parent method Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-01-15 04:44 +0000

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