Here I have a class named Arithmetic, now I want to add functionality of this class named addNum which perform add two number.

Lets see the example

class Arithmetic(object): pass def arithmetic_function_add(cls): def sampleFunction(self,a,b): return a+b sampleFunction.__name__ = "addNum" setattr(cls,sampleFunction.__name__,sampleFunction) arithmetic_function_add(Arithmetic) arithmetic=Arithmetic() print arithmetic.addNum(5,6)

**Output:**

11