How to replace an instance method?

[Eryk Sun]

On 9/18/22, Stefan Ram <ram at zedat.fu-berlin.de> wrote:
> ram at zedat.fu-berlin.de (Stefan Ram) writes (abbreviated):
>>types.MethodType( function, instance )
>>functools.partial( function, instance )
>>new_method.__get__( instance )
>
>   I wonder which of these three possibilities expresses
>   the idea of creating a new method from a function and
>   an instance most clearly.

Using types.MethodType(function, instance) is the most clear and
correct of the three. Using the function's descriptor __get__() method
is equivalent in terms of the result. That said, the descriptor
protocol is an intermediate-level concept, so manually calling
__get__() isn't friendly to novices or casual users of the language.

Using a functools.partial isn't the expected method type, with
__func__ and __self__ attributes, and, unlike a method, it doesn't
expose the wrapped function's __code__, __name__, __module__, __doc__,
__annotations__, __defaults__, __kwdefaults__, __closure__,
__globals__, or __builtins__. If dynamic inspection matters, using a
functools.partial won't work directly with dis.dis(),
inspect.getfile(), inspect.getsource(), inspect.getdoc(),
inspect.get_annotations(), inspect.getcallargs(), or
inspect.getclosurevars().