python课堂整理10---局部变量与全局变量

name = ‘lhf‘  #全局变量
def change_name():
    name = ‘大帅比‘  #局部变量  只在这一段函数里生效
    print(name)      #先从当前作用域找name,找不到再往外层找

change_name()
print(name)

NAME = ‘lhf‘
def change_name():
    global NAME   #声明全局变量，把最外层的全局变量NAME 拿来用
    NAME = "dabai"  #修改全局变量
    print(NAME)
print(NAME)
change_name()
print(NAME)

NAME = [1, 2]
def test():
    NAME = ‘自己‘   #又新定义了一个局部变量
    print(‘我爱‘, NAME)
test()
print(NAME)

NAME = [1, 2]
def test():
    NAME.append(‘你‘)  #对可变的全局变量进行内部修改
    print(‘我爱‘, NAME[2])
test()
print(NAME)

NAME = [1, 2]
def test():
    global NAME
    NAME = ‘自己‘
    print(‘我爱‘,NAME)
test()
print(NAME)

NAME = [1, 2]
def test():
    NAME = ‘自己‘
    global NAME
    print(‘我爱‘,NAME)
test()
print(NAME)

name = ‘大白‘

def cuoai():
    name = ‘liu‘
    def pianai():
        global name
        name = ‘wen‘
    pianai()
    print(name)
print(name)
cuoai()
print(name)

name = ‘大白‘

def cuoai():
    name = ‘liu‘
    def pianai():
        nonlocal name
        name = ‘wen‘
    pianai()
    print(name)
print(name)
cuoai()
print(name)