Question

I have about 20 methods to redirect to a wrapper method that takes the original method, and the rest of the arguments:

class my_socket(parent):

    def _in(self, method, *args, **kwargs):
        # do funky stuff

    def recv(self, *args, **kwargs):
        return self._in(super().recv, *args, **kwargs)

    def recv_into(self, *args, **kwargs):
        return self._in(super().recv_into, *args, **kwargs)

    # and so on...

How can I add more of these methods programmatically? This is about as far as I get before everything starts to look wrong:

for method in 'recv', 'recvfrom', 'recvfrom_into', 'recv_into', ...:
    setattr(my_socket, method, ???)

Can I do this by assigning within the class definition, or something else that feels more natural?

class my_socket(parent):

    def makes_recv_methods(name):
        # wraps call to name

    def recv_meh = makes_recv_methods('recv_meh')

I’d prefer to use __get__ and friends when possible over magic functions from types.

Answer 1

I’d do it by running some code to generate the methods from a list after the class is defined – you could put this into a decorator.

import functools

def wrap_method(cls, name):
    # This unbound method will be pulled from the superclass.
    wrapped = getattr(cls, name)
    @functools.wraps(wrapped)
    def wrapper(self, *args, **kwargs):
        return self._in(wrapped.__get__(self, cls), *args, **kwargs)
    return wrapper

def wrap_methods(cls):
    for name in cls.WRAP_ATTRS:
        setattr(cls, name, wrap_method(cls, name))
    return cls

@wrap_methods
class my_socket(parent_class):
    WRAP_ATTRS = ['recv', 'recvfrom'] # ... + more method names

    def _in(self, method, *args, **kwargs):
        # do funky stuff