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devel / comp.lang.python / Re: How to replace an instance method?

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o Re: How to replace an instance method?Chris Angelico

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Re: How to replace an instance method?

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From: rosuav@gmail.com (Chris Angelico)
Newsgroups: comp.lang.python
Subject: Re: How to replace an instance method?
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 by: Chris Angelico - Sat, 17 Sep 2022 21:27 UTC

On Sun, 18 Sept 2022 at 07:20, Ralf M. <Ralf_M@t-online.de> wrote:
>
> Am 16.09.2022 um 23:34 schrieb Eryk Sun:
> > On 9/16/22, Ralf M. <Ralf_M@t-online.de> wrote:
> >> I would like to replace a method of an instance, but don't know how to
> >> do it properly.
> >
> > A function is a descriptor that binds to any object as a method. For example:
> >
> > >>> f = lambda self, x: self + x
> > >>> o = 42
> > >>> m = f.__get__(o)
> > >>> type(m)
> > <class 'method'>
> > >>> m.__self__ is o
> > True
> > >>> m(10)
> > 52
>
> Thank you and Chris A. for the two suggestions how to replace a method.
>
> I tried both
> inst.method = functools.partial(new_method, inst)
> and
> inst.method = new_method.__get__(inst)
> and both work in my toy example.
> I will try it on the real code next week.
>
> Even though the functools.partial solution is easier to understand (at
> least for me), I will probably use the __get__ solution as it avoids
> the import of an extra library.
>

The two are basically equivalent. Using functools.partial emphasizes
the fact that all you're doing is "locking in" the first parameter;
using the __get__ method emphasizes the fact that functions are,
fundamentally, the same thing as methods. Choose whichever one makes
sense to you!

ChrisA

devel / comp.lang.python / Re: How to replace an instance method?

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