1 >>> class A:
 2 	pass
 3 
 4 >>> A.f = lambda self, x: 2*x
 5 >>> a = A()
 6 >>> a.f(3)
 7 6
 8 >>> A.__dict__['g'] = lambda self, x: x*5
 9 >>> a.g(12)
10 60
11 >>>