On 9/19/22, 2qdxy4rzwzuui...@potatochowder.com <2qdxy4rzwzuui...@potatochowder.com> wrote: > On 2022-09-18 at 09:11:28 +0000, > Stefan Ram <r...@zedat.fu-berlin.de> wrote: > >> r...@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. > > The first one. And only the first one. > > The second one requires too much inside knowledge of Python to make the > leap from currying to instance method. > > The third one doesn't even mention the function.
The OP's example named the function "new_method". In general the third case would be func.__get__(instance). It's how the interpreter binds a new method when a function from the class hierarchy is accessed as an instance attribute. When a function from the class hierarchy is accessed as an attribute of the class, it's equivalent to calling func.__get__(None, cls), which just returns a reference to the function. To use the descriptor protocol to bind a function as a method of the class requires wrapping it with the classmethod descriptor type. For example, classmethod(func).__get__(None, cls) returns a method object with __self__ that references the cls type. Of course, calling types.MethodType(func, cls) is easier to understand and the preferred way. -- https://mail.python.org/mailman/listinfo/python-list
