A class method which behaves differently when called as an instance method?

Question

I\'m wondering if it\'s possible to make a method which behaves differently when called as a class method than when called as an instance method.

For example, as a skill

Answer 1

Questionably useful Python hacks are my forte.

from types import *

class Foo(object):
    def __init__(self):
        self.bar = methodize(bar, self)
        self.baz = 999

    @classmethod
    def bar(cls, baz):
        return 2 * baz


def methodize(func, instance):
    return MethodType(func, instance, instance.__class__)

def bar(self):
    return 4*self.baz


>>> Foo.bar(5)
10
>>> a=Foo()
>>> a.bar()
3996