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Groups > comp.lang.python > #104747

Re: Encapsulation in Python

From Chris Angelico <rosuav@gmail.com>
Newsgroups comp.lang.python
Subject Re: Encapsulation in Python
Date 2016-03-13 15:05 +1100
Message-ID <mailman.55.1457841930.12893.python-list@python.org> (permalink)
References (2 earlier) <6984dafc-fffd-4d46-a173-421bb5c142d2@googlegroups.com> <dkh7i8Frq0gU1@mid.individual.net> <a619fe22-7152-4da6-b571-3efc29914936@googlegroups.com> <mailman.44.1457817037.12893.python-list@python.org> <69479550-3abf-4a11-a583-1cc549220b08@googlegroups.com>

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On Sun, Mar 13, 2016 at 2:36 PM, Rick Johnson
<rantingrickjohnson@gmail.com> wrote:
> On Saturday, March 12, 2016 at 3:10:49 PM UTC-6, Chris Angelico wrote:
>> Also, if currentModule.py is pulling foo from modX, then modZ.py is an
>> implementation detail. You don't necessarily want to go straight
>> there; tracing the chain is more likely to be the correct behaviour.
>> Suppose modX.py actually looks like this:
>>
>> if 'posix' in some_magic:
>>     import posixY as modY
>> elif 'nt' in some_magic:
>>     import ntY as modY
>> else:
>>     raise ImportError
>
> Ha, well, along with my example, this is another good
> example of a very bad design ;-). It's a terrible sin to
> import a symbol through multiple modules, but to import a
> symbol through multiple modules *AND* redefine it along the
> way, well, that should be punishable by the fatal exception.
> No judge, no jury. Just swift, and absolute, justice. :-)

Good. Go complain to the os module about how it's doing the wrong
thing. This is exactly what it does to provide os.path.

ChrisA

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Thread

Re: Encapsulation in Python Ian Kelly <ian.g.kelly@gmail.com> - 2016-03-10 08:27 -0700
  Re: Encapsulation in Python Rick Johnson <rantingrickjohnson@gmail.com> - 2016-03-10 16:45 -0800
    Re: Encapsulation in Python Ian Kelly <ian.g.kelly@gmail.com> - 2016-03-11 08:47 -0700
      Re: Encapsulation in Python Rick Johnson <rantingrickjohnson@gmail.com> - 2016-03-11 18:39 -0800
        Re: Encapsulation in Python Ian Kelly <ian.g.kelly@gmail.com> - 2016-03-12 09:44 -0700
          Re: Encapsulation in Python Rick Johnson <rantingrickjohnson@gmail.com> - 2016-03-12 19:11 -0800
          Re: Encapsulation in Python Steven D'Aprano <steve@pearwood.info> - 2016-03-13 21:11 +1100
            Re: Encapsulation in Python Rick Johnson <rantingrickjohnson@gmail.com> - 2016-03-14 10:32 -0700
              Re: Encapsulation in Python Ian Kelly <ian.g.kelly@gmail.com> - 2016-03-14 15:09 -0600
              Re: Encapsulation in Python Mark Lawrence <breamoreboy@yahoo.co.uk> - 2016-03-14 21:23 +0000
                Re: Encapsulation in Python BartC <bc@freeuk.com> - 2016-03-14 22:07 +0000
                Re: Encapsulation in Python Mark Lawrence <breamoreboy@yahoo.co.uk> - 2016-03-14 22:20 +0000
                Re: Encapsulation in Python BartC <bc@freeuk.com> - 2016-03-14 22:40 +0000
                Re: Encapsulation in Python Mark Lawrence <breamoreboy@yahoo.co.uk> - 2016-03-14 23:19 +0000
                Re: Encapsulation in Python BartC <bc@freeuk.com> - 2016-03-14 23:56 +0000
                Re: Encapsulation in Python Chris Angelico <rosuav@gmail.com> - 2016-03-15 11:12 +1100
                Re: Encapsulation in Python BartC <bc@freeuk.com> - 2016-03-15 00:54 +0000
                Re: Encapsulation in Python Chris Angelico <rosuav@gmail.com> - 2016-03-15 11:58 +1100
                Re: Encapsulation in Python BartC <bc@freeuk.com> - 2016-03-15 01:22 +0000
                Re: Encapsulation in Python Chris Angelico <rosuav@gmail.com> - 2016-03-15 13:02 +1100
                Re: Encapsulation in Python Mark Lawrence <breamoreboy@yahoo.co.uk> - 2016-03-15 00:28 +0000
                Re: Encapsulation in Python BartC <bc@freeuk.com> - 2016-03-15 01:10 +0000
                Re: Encapsulation in Python Chris Angelico <rosuav@gmail.com> - 2016-03-15 12:23 +1100
                Re: Encapsulation in Python Mark Lawrence <breamoreboy@yahoo.co.uk> - 2016-03-15 04:41 +0000
                Re: Encapsulation in Python rurpy@yahoo.com - 2016-03-14 17:17 -0700
                Re: Encapsulation in Python Chris Angelico <rosuav@gmail.com> - 2016-03-15 11:25 +1100
                Re: Encapsulation in Python Steven D'Aprano <steve@pearwood.info> - 2016-03-15 13:06 +1100
                Re: Encapsulation in Python Chris Angelico <rosuav@gmail.com> - 2016-03-15 13:14 +1100
                Re: Encapsulation in Python Steven D'Aprano <steve@pearwood.info> - 2016-03-15 13:40 +1100
                Re: Encapsulation in Python Rick Johnson <rantingrickjohnson@gmail.com> - 2016-03-14 21:08 -0700
                Re: Encapsulation in Python Mark Lawrence <breamoreboy@yahoo.co.uk> - 2016-03-15 00:47 +0000
                Re: Encapsulation in Python Steven D'Aprano <steve@pearwood.info> - 2016-03-15 13:46 +1100
                Re: Encapsulation in Python Chris Angelico <rosuav@gmail.com> - 2016-03-15 11:56 +1100
                Re: Encapsulation in Python Mark Lawrence <breamoreboy@yahoo.co.uk> - 2016-03-15 04:36 +0000
                Re: Encapsulation in Python Steven D'Aprano <steve@pearwood.info> - 2016-03-15 13:01 +1100
                Re: Encapsulation in Python Mark Lawrence <breamoreboy@yahoo.co.uk> - 2016-03-15 04:45 +0000
                Re: Encapsulation in Python Christian Gollwitzer <auriocus@gmx.de> - 2016-03-15 22:02 +0100
                Re: Encapsulation in Python BartC <bc@freeuk.com> - 2016-03-16 00:39 +0000
                Re: Encapsulation in Python BartC <bc@freeuk.com> - 2016-03-16 22:58 +0000
        Re: Encapsulation in Python sohcahtoa82@gmail.com - 2016-03-14 11:11 -0700
          Re: Encapsulation in Python Rick Johnson <rantingrickjohnson@gmail.com> - 2016-03-14 23:09 -0700
      Re: Encapsulation in Python Rick Johnson <rantingrickjohnson@gmail.com> - 2016-03-11 18:56 -0800
    Re: Encapsulation in Python Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2016-03-12 13:52 +1300
      Re: Encapsulation in Python Rick Johnson <rantingrickjohnson@gmail.com> - 2016-03-12 08:49 -0800
        Re: Encapsulation in Python Chris Angelico <rosuav@gmail.com> - 2016-03-13 08:10 +1100
          Re: Encapsulation in Python Rick Johnson <rantingrickjohnson@gmail.com> - 2016-03-12 19:36 -0800
            Re: Encapsulation in Python Chris Angelico <rosuav@gmail.com> - 2016-03-13 15:05 +1100
        Re: Encapsulation in Python Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2016-03-14 12:35 +1300
          Re: Encapsulation in Python Rick Johnson <rantingrickjohnson@gmail.com> - 2016-03-14 15:55 -0700

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