闭包

# 闭包
def my_power():
    n = 2

    def power(x):
        return x ** n

    return power


# n=3  输出依旧是16
power = my_power()
print(power(4))
print(power.__closure__)  #(<cell at 0x000001AF21C97BE0: int object at 0x000001AF219B6930>,)
#下面此类型并不是闭包
n = 2
def my_power1():
    def power1(x):
        return x ** n
    return power1
n=3  #64
power1 = my_power1()
print(power1(4))
print(power1.__closure__)  #None