import time
user,passwd = "gx","gx123"
def auth(func):
    def wrapper(*args,**kwargs):
        username  = input("username:").strip()
        password = input("password:").strip()
        if user == username and passwd == password:
            print("you has passed")
            f = func(*args,**kwargs)#func执行后没有返回值，没有传给谁
            print(f)
        else:
            exit("you are wrong")
    return wrapper

def index():
    print("welcome to the index")
@auth
def home():
    print("welcome to the home")
    return "from home"   #print(f),这时候return值传给了f，所以from home就显示出来了
@auth
def bbs():
    print("welcome to the bbs")


index()
home()  #调用home == 调用 wrapper
bbs()