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Re: How to pass class instance to a method?

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References <3193e3dd-0507-4ff7-9026-ee80e5d9c1dd@googlegroups.com> <pan.2012.11.26.16.56.29.389000@nowhere.com> <CALwzidn54ko2AGEj2QmanfFsoUBSqrNJ=TwNjCJt7-+_O2qu-w@mail.gmail.com> <50B3E617.3040302@davea.name>
From Ian Kelly <ian.g.kelly@gmail.com>
Date Mon, 26 Nov 2012 16:07:10 -0700
Subject Re: How to pass class instance to a method?
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On Mon, Nov 26, 2012 at 2:58 PM, Dave Angel <d@davea.name> wrote:
> Not how I would put it.  In a statically typed language, the valid types
> are directly implied by the function parameter declarations,

As alluded to in my previous post, not all statically typed languages
require parameter type declarations to perform static checking.

> while in a
> dynamic language, they're defined in the documentation, and only
> enforced (if at all) by the body of the function.

That's not even true for Python.  The following example uses Python 2.x:

>>> class Foo(object):
...     def method(self):
...         pass
...
>>> Foo.method(4)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: unbound method method() must be called with Foo instance as
first argument (got int instance instead)

That's a run-time check, and it's not enforced by the body of the function.

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Thread

How to pass class instance to a method? ALeX inSide <alex.b.inside@gmail.com> - 2012-11-25 04:11 -0800
  Re: How to pass class instance to a method? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-11-25 12:37 +0000
  Re: How to pass class instance to a method? Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2012-11-26 11:22 +1300
  Re: How to pass class instance to a method? Alain Ketterlin <alain@dpt-info.u-strasbg.fr> - 2012-11-26 11:08 +0100
  Re: How to pass class instance to a method? Nobody <nobody@nowhere.com> - 2012-11-26 16:56 +0000
    Re: How to pass class instance to a method? Ian Kelly <ian.g.kelly@gmail.com> - 2012-11-26 13:51 -0700
    Re: How to pass class instance to a method? Dave Angel <d@davea.name> - 2012-11-26 16:58 -0500
      Re: How to pass class instance to a method? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-11-26 22:18 +0000
        Re: How to pass class instance to a method? Dave Angel <d@davea.name> - 2012-11-26 22:14 -0500
          Re: How to pass class instance to a method? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-11-27 04:10 +0000
            Re: How to pass class instance to a method? Roy Smith <roy@panix.com> - 2012-11-26 23:25 -0500
            Re: How to pass class instance to a method? Dave Angel <d@davea.name> - 2012-11-27 00:18 -0500
    Re: How to pass class instance to a method? Ian Kelly <ian.g.kelly@gmail.com> - 2012-11-26 16:07 -0700
      Re: How to pass class instance to a method? Hans Mulder <hansmu@xs4all.nl> - 2012-11-27 01:36 +0100
    Re: How to pass class instance to a method? Dave Angel <d@davea.name> - 2012-11-26 21:50 -0500
  Re: How to pass class instance to a method? Drew <r.drew.davis@gmail.com> - 2012-11-26 17:14 -0800

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