1,简单的装饰器
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USER_INFO = {} #定义全局变量,据此来判断是否登录成功
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def outer(func):
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def inner(*args, **kwargs):
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if USER_INFO.get("is_login", None): #先判断用户时候登录成功
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r = func(*args,**kwargs)
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return r
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else: #登录不成功,则提示用户先登录
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print("请先登录")
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return inner
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def login(user, pwd):
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if user == "alex" and pwd == "123456":
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print("欢迎%s光临!" % (user,))
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USER_INFO["is_login"] = True
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return True
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else:
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print("用户名或者密码错误!")
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@outer
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def balance():
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print("\n你的余额为:3000元整\n")
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@outer
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def point():
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print("\n你的积分为:18000\n")
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@outer
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def personal_info():
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print("\n你的个人信息为:xxxxxx\n")
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def main():
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while True:
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res = input("1,登录 2,积分查询 3,余额查询 4,个人信息查询\n请输入选择>>>")
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if res == "1":
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username = input("请输入用户名:")
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password = input("请输入密码:")
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login(username, password)
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elif res == "2":
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point()
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elif res == "3":
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balance()
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elif res == "4":
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personal_info()
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else:
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print("输入错误!请重新输入")
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main()
2,多层装饰器
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USER_INFO = {} #判断是否登录成功
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USER_TYPE = {} #判断用户类型,是不是超级管理
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def check_login(func):
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def inner(*args, **kwargs):
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if USER_INFO.get("is_login", None):
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r = func(*args, **kwargs)
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return r
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else:
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print("请先登录")
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return inner
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def check_admin(func):
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def inner(*args, **kwargs):
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if USER_TYPE.get("type", None) == 2:
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r = func(*args, **kwargs)
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return r
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else:
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print("你不是超级管理员,无权限!")
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return inner
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def login(user, pwd):
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if user == "alex" and pwd == "123":
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print("欢迎%s光临!" % (user,))
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USER_INFO["is_login"] = True
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USER_TYPE["type"] = 1
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elif user == "admin" and pwd == "123":
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print("欢迎%s光临!" % (user,))
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USER_INFO["is_login"] = True
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USER_TYPE["type"] = 2
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else:
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print("用户名或者密码错误!")
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@check_login
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def balance():
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print("\n你的余额为:3000元整\n")
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@check_login
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def point():
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print("\n你的积分为:18000\n")
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@check_login --------->首先判断是否登录成功,然后再次判断是否为管理员
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@check_admin
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def admin():
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print("你是超级管理员!")
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def main():
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while True:
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res = input("1,登录 2,积分查询 3,余额查询 4,超级管理员\n请输入选择>>>")
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if res == "1":
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username = input("请输入用户名:")
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password = input("请输入密码:")
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login(username, password)
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elif res == "2":
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point()
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elif res == "3":
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balance()
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elif res == "4":
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admin()
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else:
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print("输入错误!请重新输入")
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main()
多层装饰器。类似
还有更牛逼的装饰器以后web程序中会讲到,类似于@outer(before,after)
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