Class_op.py

class Operations:
    def sum(self,n1,n2):
        return  n1+n2
    def div(self,n1,n2):
        return n1/n2

class MultiOperations(Operations):
    def mul(self,n1,n2):
        return n1*n2
    def sum(self,n1,n2):

        return  (n1+n2)*2