#闭包：嵌套函数，内部函数 并且必须调用外部函数的变量

def outer():

    a = 1

    def inner():

        print(a)

    inner()

    print(inner.__closure__) # 说明是一个闭包函数

outer()

def outer():

    a = 1

    def inner():

        print(a)

        print('haha')

    return inner #

inn = outer()

inn()     # 在函数的外部 直接使用函数内部的函数

def outer():

    a = 1

    def inner():

        print(a)

    inner()

outer()

# import urllib  #模块

from urllib.request import urlopen

ret = urlopen('https://www.baidu.com/').read()

print(ret)

def get_url():

    url = 'https://www.baidu.com/'

    ret = urlopen(url).read()

    print(ret)

get_url()

def get_url():

    url = 'https://www.baidu.com/'

    def get():

        ret = urlopen(url).read()

        print(ret)

    return get

get_func = get_url()

get_func()