instance_overshadows_class_method.py

class MyClass(object):
    def __init__(self, msg):
        self.msg = msg

    def say_stuff(self):
        print("Standard say stuff message: {}\n\n".format(self.msg))

ob = MyClass("Here is the original message")

def say_stuff():
    m = "Thought I'd say something else, didn't you?"
    print(m)

#setattr(ob, "say_stuff", say_stuff)
ob.__dict__["say_stuff"] = say_stuff

ob.say_stuff()