python裝飾器的原理

原理:嵌套函數的使用，返回函數地址，閉包的原理

status_user = False def login(func): def inner(): global status_user _user = 'dong' _pwd = 'dong' if status_user == False: user = input('用戶名：') pwd = input('密碼：') if _pwd == pwd and _user == user: status_user = True print('用戶驗證經過') else: print('驗證失敗') if status_user: return func() return inner

def index(): print('首頁') def taobao(): print('淘寶') def jingdong(): print('京東') def yuji(): print('雲集') taobao = login(taobao) taobao()