perftesting different ways to override an arbitrary member method in python

getattr_time.py

#!/usr/bin/env python
#
# Example output:
#
# > testing mapped version
# 0.015753 usec/pass
# > waiting 1.0s
# > testing rebound version
# 0.025296 usec/pass
#
import gc
import os
import time
import timeit

class Mapped(object):
    def __init__(self):
        self.function_map = {}

    def __getattribute__(self, name):
        fun = object.__getattribute__(self, 'function_map').get(name)
        def wrapper(*args):
            return fun(self, *args)

        if fun:
            return wrapper
        else:
            return object.__getattribute__(self, name)

    def bind(self, name, function):
        self.function_map[name] = function

    def whoami(self):
        return 'old function'

class Rebound(object):
    def __init__(self):
        pass

    def whoami(self):
        return 'old function'

def test(obj, what):
    global object_to_test
    object_to_test = obj

    t = timeit.Timer('get_function', 'from __main__ import get_function')
    print "> testing %s\n%f usec/pass" % (what, 1000000 * t.timeit(number=1000000)/1000000)

    object_to_test = None

def get_function():
    return getattr(object_to_test, FUNCTION_TO_TEST)

def new_whoami(self):
    return 'new function'

FUNCTION_TO_TEST = 'whoami'
if __name__ == '__main__':
    if os.fork() == 0:
        mapped = Mapped()
        mapped.bind(FUNCTION_TO_TEST, new_whoami)
        test(mapped, 'mapped')
    else:
        time.sleep(1) # remove this and enjoy the show
        rebound = Rebound()
        setattr(Rebound, FUNCTION_TO_TEST, new_whoami)
        test(rebound, 'rebound')