# from functools import reduce
# def multiply(x):
#     return x*x

# def add(x):
#     return x+x

# funcs = [multiply, add]
# for i in range(5):
#     values = map(lambda x: x(i),funcs)
#     print(values)


# product = reduce((lambda x,y:x+y),[1,2,3,4])
# print(product)

# number_list=range(-1,30)
# oushu = filter(lambda x: x>20 , number_list)
# print(oushu)

class Rectangle():
    def __init__(self,a,b):
        self.a = a
        self.b = b
    def __str__(self):
        return str((self.a) * (self.b))
rect = Rectangle(3,4)
print(rect)