#函数嵌套:
#1 函数的桥套调用:在调用一个函数的过程中又调用其他函数


# def max2(x,y):
#     if x> y:
#         return x
#     else:
#         return y
#
#
#
# def max(a,b,c,d):
#     #第一步:比较 a b 得到res1
#     res1=max2(a,b)
#
#     #第二步:比较res1,c 得到res2
#     res2 = max2(res1, c)
#
#     #第三步:比较res2 d 得到res3
#     res3=max2(res2,d)
#
#     return res3





#2 定义.在函数内定义其他函数

# def f1():
#     def f2():
#         pass
#


#圆形
#求周长: 2 * pi * radius
def circle(radius,action=0):
    from math import pi

    def perimiter(radius):
        # return 2*pi*radius
        print(f'圆的周长是:{2*pi*radius}')

    #求面积:pi * (radius**2)
    def area(radius):
        # return pi*(radius ** 2)
        print(f'圆的面积是:{radius ** 2}')

    if action == 0:
        return perimiter(radius)

    elif action == 1:
        return area(radius)

# res=circle(33,action=0)
# print(res)

circle(33,action=1)