关键词 global 和 nonlocal

NAME = '海风'
def huangwei():
    name = '黄伟'
    print(name)
    def liuyang():
        name = '刘洋'
        print(name)

        def yangjing():
            name = '沪指花'
            print(name)
        print(name)
        yangjing()
    liuyang()
    print(name)
huangwei()
###运行顺序如图

#结果如下：

黄伟
刘洋
刘洋
沪指花
黄伟

 

 

----------------------------------------------global

name = '豆豆'
def weihou():
    name = '陈卓'
    def weiweihou():
        global name#此时的name是最外层的‘豆豆’
        name = '冷静'
    weiweihou()
    print(name)
print(name)
weihou()
print(name)
#输出结果如下;
# 豆豆  陈卓    冷静

 

---------------nolocal指的是获取上一级的变量

name = '豆豆'
def weihou():
    name = '陈卓'
    def weiweihou():
        nonlocal name#指的是上一级变量‘陈卓’
        name = '冷静'
    weiweihou()
    print(name)
print(name)
weihou()
print(name)
#输出结果如下;
# 豆豆      冷静     豆豆