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import time # 裝飾器的架子 def timer(func):def wrapper():start_time = time.time()func()stop_time = time.time()print("函數(shù)運行時間%s"%(stop_time-start_time))return wrapperdef test():time.sleep(2)print("函數(shù)運行完畢..")res = timer(test) # 返回的是wrapper函數(shù)的地址 res() # 執(zhí)行的是wrapper函數(shù)

語法糖語法

import time # 裝飾器的架子 def timer(func):def wrapper():start_time = time.time()res = func()stop_time = time.time()print("函數(shù)運行時間%s"%(stop_time-start_time))return resreturn wrapper@timer # @timer相當于 test = timer(test) def test():time.sleep(2)print("函數(shù)運行完畢..")return "test()"res = test() print(res) def decorator(func):def wrapper(*args, **kwargs):uname = input("請輸入用戶名:")pwd = input("請輸入密碼:")if (uname=="張飛" and pwd == "123"):res = func(*args, **kwargs)return reselse:print("用戶名或密碼錯誤")return wrapper@decorator def index():print("welcome to jd");@decorator def home(name):print("welcome to home, %s"%name)@decorator def shopping_car(name):print("%s的購物車都有啤酒,平板電腦"%name)#index() #home("張飛") shopping_car("張飛") user_list = [{"name":"劉備", "passwd":"123"},{"name":"關羽", "passwd":"123"},{"name":"張飛", "passwd":"123"},{"name":"趙云", "passwd":"123"}]login_user = {"username":None, "login":False} def loadMeth(loadType="oracle"):print("first",loadType)def decorator(func):print("second", loadType)def wrapper(*args, **kwargs):print("loadType:",loadType)# 如果用戶已經登錄過,則不用再次輸入用戶名 密碼if login_user["username"] and login_user["login"]:res = func(*args, **kwargs)return resuname = input("請輸入用戶名:")pwd = input("請輸入密碼:")for index, user_dic in enumerate(user_list):if (user_dic["name"]==uname and user_dic["passwd"] == pwd):login_user["username"] = unamelogin_user["login"] = Trueres = func(*args, **kwargs)return resprint("用戶名或密碼錯誤")return wrapperreturn decorator@loadMeth() #帶參數(shù)的裝飾器不是太明白. 為什么@loadMeth()和@loadMeth是不同的結構 def index():print("welcome to jd");@loadMeth() def home(name):print("welcome to home, %s"%name)@loadMeth() def shopping_car(name):print("%s的購物車都有啤酒,平板電腦"%name)print(index) print(home)index() print(home) home("趙云") shopping_car("趙云") print(login_user)

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