26 Jun 2017
# coding:utf-8 from operator import add, sub, mul, div class Cal(object): def __init__(self, x): super(Cal, self).__init__() self.x = x def __add__(self, y): self.x += y return self.x def __sub__(self, y): self.x -= y return self.x def __mul__(self, y): self.x *= y return self.x def __div__(self, y): self.x /= y return self.x if __name__ == '__main__': base = Cal(3) # add x = base.x add(base, 1) print "{x} + 1 = {base}".format(x=x, base=base.x) # subtract x = base.x sub(base, 1) print "{x} - 1 = {base}".format(x=x, base=base.x) # multiply x = base.x mul(base, 2) print "{x} * 2 = {base}".format(x=x, base=base.x) # divide x = base.x div(base, 3) print "{x} / 3 = {base}".format(x=x, base=base.x)