How to add a method to an object's instance

adding_a_method.py

#!/usr/bin/env python
# coding: utf-8

"""
Shows how to add a method to a instance of an object.
"""

class Useless:
    """
    Does nothing, unless you hack it.
    """

    pass


def hacker_method(self):
    """
    Returns hacked object.
    """

    return self

my_useless = Useless()
my_useless.hacker_method = hacker_method.__get__(my_useless)

print my_useless == my_useless.hacker_method()  # True
print id(my_useless) == id(my_useless.hacker_method())  # Also True