函数的嵌套定义

def outer():
    x = 1
    print("outer")
    def innre():
        print("innre")
    return innre
res = outer()
print(res)
res()
结果：outer
　　这个空函数的内存innre的地址
　　<function outer.<locals>.innre at 0x000001F33EA52D08>
　　innre
"""
函数内定义函数的应用场景


"""