import types

class A(object):
    pass

def f(c):
    print c

A.f = types.MethodType(f, A, type)
A.f()

class A(object):
    @classmethod
    def wtf(cls):
        print cls

class B(object): pass

print A.wtf
A.wtf()

B.wtf = A.wtf
print B.wtf
B.wtf()

# the following two both work, i don't know which is better
import new
B.wtf = new.instancemethod(A.wtf.__func__, B, type)
print B.wtf
B.wtf()

import types
B.wtf = types.MethodType(A.wtf.__func__, B, type)
print B.wtf
B.wtf()

class A(object):
@staticmethod
def wtf():
    print "wtf"

class B(object): pass

B.wtf = staticmethod(A.wtf)
print B.wtf
B.wtf()