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Re: Nice solution wanted: Hide internal interfaces

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On Oct 30, 2:33 am, Johannes Bauer <dfnsonfsdu...@gmx.de> wrote:
> I'm currently looking for a good solution to the following problem: I
> have two classes A and B, which interact with each other and which
> interact with the user. Instances of B are always created by A.
>
> Now I want A to call some private methods of B and vice versa (i.e. what
> C++ "friends" are), but I want to make it hard for the user to call
> these private methods.

One approach could be to only have the public interface on B, and then
create a wrapper for B that provides the private interface:

    class B:
        def public_method(self):
            pass

    class B_Private:
        def __init__(self, context):
            self.context = context

        def private_method(self):
            # manipulate self.context

    class A:
        def __init__(self):
            self.b = B()
            self.b_private = B_Private(self.b)

        def foo(self):
            # call public method
            self.b.public_method()

            # call private method
            self.b_private.private_method()

It doesn't stop a user from accessing the private methods, but it does
separate them so they have to *intentionally* choose to use them.

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Nice solution wanted: Hide internal interfaces Johannes Bauer <dfnsonfsduifb@gmx.de> - 2012-10-29 17:33 +0100
  Re: Nice solution wanted: Hide internal interfaces andrea crotti <andrea.crotti.0@gmail.com> - 2012-10-29 16:41 +0000
  Re: Nice solution wanted: Hide internal interfaces Benjamin Kaplan <benjamin.kaplan@case.edu> - 2012-10-29 09:41 -0700
  Re: Nice solution wanted: Hide internal interfaces Chris Angelico <rosuav@gmail.com> - 2012-10-30 03:47 +1100
    Re: Nice solution wanted: Hide internal interfaces Johannes Bauer <dfnsonfsduifb@gmx.de> - 2012-10-29 17:58 +0100
      Re: Nice solution wanted: Hide internal interfaces Paul Rubin <no.email@nospam.invalid> - 2012-10-29 10:03 -0700
      Re: Nice solution wanted: Hide internal interfaces Grant Edwards <invalid@invalid.invalid> - 2012-10-29 18:00 +0000
      Re: Nice solution wanted: Hide internal interfaces Ian Kelly <ian.g.kelly@gmail.com> - 2012-10-29 13:09 -0600
  Re: Nice solution wanted: Hide internal interfaces Grant Edwards <invalid@invalid.invalid> - 2012-10-29 16:52 +0000
    Re: Nice solution wanted: Hide internal interfaces Johannes Bauer <dfnsonfsduifb@gmx.de> - 2012-10-29 18:01 +0100
      Re: Nice solution wanted: Hide internal interfaces Peter Otten <__peter__@web.de> - 2012-10-29 18:17 +0100
  Re: Nice solution wanted: Hide internal interfaces Peter Otten <__peter__@web.de> - 2012-10-29 18:06 +0100
  Re: Nice solution wanted: Hide internal interfaces Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-10-29 22:37 +0000
  Re: Nice solution wanted: Hide internal interfaces alex23 <wuwei23@gmail.com> - 2012-10-29 18:37 -0700
    Re: Nice solution wanted: Hide internal interfaces andrea crotti <andrea.crotti.0@gmail.com> - 2012-10-30 14:15 +0000

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