闭包

def hello(username):

username = '大西瓜'

def world(status):

return username+status

return world

def nihao(username):

username='小西瓜'

def world(status):

return username+status

return world

# world1 = hello('张三')

# world2 = hello('李四')

# print(world1('作业交了'))

# print(world2('作业没交'))