Path: csiph.com!fu-berlin.de!uni-berlin.de!not-for-mail
From: Ian Kelly <ian.g.kelly@gmail.com>
Newsgroups: comp.lang.python
Subject: Re: Promoting Python
Date: Thu, 7 Apr 2016 00:56:18 -0600
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Message-ID: <mailman.3.1460012220.2253.python-list@python.org>
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Xref: csiph.com comp.lang.python:106617

On Thu, Apr 7, 2016 at 12:30 AM, Marko Rauhamaa <marko@pacujo.net> wrote:
> Or:
>
>    When a class attribute reference (for class C, say) would yield a
>    class method object, it is transformed into an instance method object
>    whose __self__ attributes is C.
>    <URL: https://docs.python.org/3/reference/datamodel.html?highlight=__g
>    etattr__#the-standard-type-hierarchy>
>
> So the only difference between a regular function and an instance method
> object is the fact that the latter has a __self__ attribute set.
>
> Although even that small difference can be paved over:
>
>     def g():
>         print("g")
>     g.__self__ = a
>     a.f = g

What is this example supposed to accomplish?  Functions don't merely
not have a __self__ attribute set. The __self__ attribute has no
meaning on a function.

Let's take a different example.


class Dialog(Window):

    def __init__(self, parent, title, ok_callback):
        super().__init__(parent, title)
        self._ok_callback = ok_callback
        self._ok_button = Button(self, 'Ok')
        self._ok_button.bind(self._ok_callback)

def f(event):
    print("Hello world")

dialog = Dialog(None, "Example", f)
dialog.show()


Are you suggesting that dialog._ok_callback should be considered a
method of Dialog, despite the fact that the implementation of Dialog
and the implementation of f are entirely unrelated? If so, then I
think that most OOP practitioners would disagree with you.