x=3
y=4
x,y=y,x
print(x,y)

def idf(func):#验证登入信息是否正确 装饰器函数
    def wrapper(*args,**kwargs):
        username=input('please input username: '.strip())#.strip指的是移除前后空格或者制表符
        password=input('pleasr input password: '.strip())
        if username=='sxj' and password=='abc':
            print("验证通过")
            res = func(*args, **kwargs)
            return res
        else:
            print('I am sorry')
    return wrapper

@idf
def index():
    print('welcome to index')

@idf
def home(name):
    print('%s,welcome to home'%name)

@idf
def shopping_car():
    print('this is shopping car,you have %s,%s,%s'%('奶茶','妹妹','sxj'))

home('sxj')
shopping_car()

>>>

please input username:sxj
pleasr input password:abc
验证通过
sxj,welcome to home
please input username:sxj
pleasr input password:abc
验证通过
this is shopping car,you have 奶茶,妹妹,sxj

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