python（15）- 装饰器及装饰器的使用

装饰器

1.无参数

2.函数有参数

3.函数动态参数

 4.装饰器参数 

 

 

 

装饰器的应用

下面题目同http://www.cnblogs.com/xuyaping/p/6679305.html，只不过加了装饰器统计时间和认证功能。

 

1、定义无参装饰器为被装饰器添加统计运行时间的功能

#定义闭包无参函数，为程序增加统计时间功能
import time
def timer(func):         #定义timer函数，func变量值为login
    def wrapper():       
        start_time=time.time()   #设置函数起始时间
        func()                   #函数名加（）调用函数，即调用login（），然后调用结束后继续在wrapper函数中运行
        stop_time=time.time()
        print("run time is %s"%(stop_time-start_time))
    return wrapper   #返回wrapper函数名，然后再次进入wrapper函数

@timer        #相当于timer(login)-->赋值给timer函数名
def login():
    #读取注册用户的信息，用户名，密码，输错次数，写入字典中
    user={}
    with open("DB1",encoding="utf8") as f:
        for line in f:
            username_list=line.strip().split("|")      #username_list--->['egon', '123', '2']
            user[username_list[0]]={"name":username_list[0],
                     "pwd":username_list[1],
                     "times":username_list[2]}
    # print(user)  #-->{'egon': {'name': 'egon', 'pwd': '123', 'times': '2'}, 'xuyaping': {'name': 'xuyaping', 'pwd': '123', 'times': '0'}, 'xyy': {'name': 'xyy', 'pwd': '123', 'times': '1'}}
 
    #读取黑名单用户，将黑名单用户加入列表中
    with open("black_lockname",encoding="utf8") as f1:
        black_list=[]
        for line in f1:
            black_list.append(line.strip())
    # print(black_list)
 
 
    while True:
        username = input("please input your username:").strip()
        passwd = input("please input your passwd:").strip()
        #用户在黑名单中
        if username in black_list:
            print("该用户为黑名单用户，请滚")
            break
 
        # 用户为注册用户
        elif username in user:
            user[username]["times"]=int(user[username]["times"])
            if user[username]["times"]<3 and passwd==user[username]["pwd"]:
                print("登录成功")
                user[username]["times"]=0
                #将修改后的信息重新写入DB1中
                with open("DB1","w",encoding="utf8") as f3:
                    for i in user:
                        f3.write(i + "|" + user[i]["pwd"] + "|" + str(user[i]["times"]) + "
")
                break
 
            else:
                user[username]["times"]+=1
                print("登录错误")
                # 将修改后的信息重新写入DB1中
                with open("DB1", "w", encoding="utf8") as f3:
                    for i in user:
                        f3.write(i + "|" + user[i]["pwd"] + "|" + str(user[i]["times"]) + "
")
                if user[username]["times"]==3:
                    black_list.append(username)
                    print("账户被锁定")
                    # 将修改后的信息重新写入black_lockname中
                    with open("black_lockname","w",encoding="utf8") as f4:
                        for j in black_list:
                            f4.write(j+ "
")
                    break
 
        #用户不是注册用户
        else:
            print("该用户没有注册")
            break

login()

　　 

 

2、定义有参装饰器为被装饰器添加认证功能：用户的信息可以来源于file也可以是ldap，三次验证失败锁定用户

 

#定义闭包有参函数，为程序增加验证功能
def auth2(auth_type):       
    def auth(func):   #func参数此时被赋值为login
        def wragger(*args,**kwargs):   #wragger函数携带变量auth_type的值
            if auth_type=="file":
                func()     #运行函数login
            elif auth_type=="ldap":
                print("你他妈还想不想玩了？")

        return wragger
    return auth

@auth2(auth_type="file")   #相当于运行函数auth2（file），返回auth，auth(login)赋值给login函数名
def login():
    #读取注册用户的信息，用户名，密码，输错次数，写入字典中
    user={}
    with open("DB1",encoding="utf8") as f:
        for line in f:
            username_list=line.strip().split("|")      #username_list--->['egon', '123', '2']
            user[username_list[0]]={"name":username_list[0],
                     "pwd":username_list[1],
                     "times":username_list[2]}
    # print(user)  #-->{'egon': {'name': 'egon', 'pwd': '123', 'times': '2'}, 'xuyaping': {'name': 'xuyaping', 'pwd': '123', 'times': '0'}, 'xyy': {'name': 'xyy', 'pwd': '123', 'times': '1'}}
 
    #读取黑名单用户，将黑名单用户加入列表中
    with open("black_lockname",encoding="utf8") as f1:
        black_list=[]
        for line in f1:
            black_list.append(line.strip())
    # print(black_list)
 
 
    while True:
        username = input("please input your username:").strip()
        passwd = input("please input your passwd:").strip()
        #用户在黑名单中
        if username in black_list:
            print("该用户为黑名单用户，请滚")
            break
 
        # 用户为注册用户
        elif username in user:
            user[username]["times"]=int(user[username]["times"])
            if user[username]["times"]<3 and passwd==user[username]["pwd"]:
                print("登录成功")
                user[username]["times"]=0
                #将修改后的信息重新写入DB1中
                with open("DB1","w",encoding="utf8") as f3:
                    for i in user:
                        f3.write(i + "|" + user[i]["pwd"] + "|" + str(user[i]["times"]) + "
")
                break
 
            else:
                user[username]["times"]+=1
                print("登录错误")
                # 将修改后的信息重新写入DB1中
                with open("DB1", "w", encoding="utf8") as f3:
                    for i in user:
                        f3.write(i + "|" + user[i]["pwd"] + "|" + str(user[i]["times"]) + "
")
                if user[username]["times"]==3:
                    black_list.append(username)
                    print("账户被锁定")
                    # 将修改后的信息重新写入black_lockname中
                    with open("black_lockname","w",encoding="utf8") as f4:
                        for j in black_list:
                            f4.write(j+ "
")
                    break
 
        #用户不是注册用户
        else:
            print("该用户没有注册")
            break

login()