Python学习之路：装饰器实现终极版

网站实现验证功能装饰器：

import time
user,passwd='alex','abc123'
def auth(func):
    def wrapper(*args,**kwargs):
        print("wraper func args:",*args,**kwargs)
        username=input("Username:").strip()
        password=input("Password:").strip()

        if user==username and passwd==password:
            print("33[32;1mUser has passed authentication33[0m")
            func(*args,**kwargs)#
            #print("---after authentication---")#保留要装饰函数home的输出结果
            #return res
        else:
            exit("33[31;1mInvalid username or password33[0m")
    return wrapper


def index():
    print("welcome to index page")

@auth
def home():
    print("welcome to home page ")
    return "from home"

@auth
def bbs():
    print("welcome to bbs page")

index()
home()
print(home())#执行结果为空，调用home相当于调用wraper
bbs()

 保留要装饰函数的返回结果：

import time
user,passwd='alex','abc123'
def auth(func):
    def wrapper(*args,**kwargs):
        print("wraper func args:",*args,**kwargs)
        username=input("Username:").strip()
        password=input("Password:").strip()

        if user==username and passwd==password:
            print("33[32;1mUser has passed authentication33[0m")
            res=func(*args,**kwargs)#
            print("---after authentication---")#保留要装饰函数home的输出结果
            return res
        else:
            exit("33[31;1mInvalid username or password33[0m")
    return wrapper


def index():
    print("welcome to index page")

@auth
def home():
    print("welcome to home page ")
    return "from home"

@auth
def bbs():
    print("welcome to bbs page")

index()
home()
print(home())#执行结果为空，调用home相当于调用wraper
bbs()

 不同网页不同验证方式的装饰器：

import time
user,passwd='alex','abc123'
def auth(auth_type):
    print("auth func:",auth_type)
    def outer_auth(func):
        def wrapper(*args,**kwargs):
            print("wraper func args:",*args,**kwargs)
            if auth_type=="local":
                username=input("Username:").strip()
                password=input("Password:").strip()

                if user==username and passwd==password:
                    print("33[32;1mUser has passed authentication33[0m")
                    res=func(*args,**kwargs)#
                    print("---after authentication---")#保留要装饰函数home的输出结果
                    return res
                else:
                    exit("33[31;1mInvalid username or password33[0m")
            elif auth_type=="ldap":
                print("搞毛线ldap,不会。。。。")
        return wrapper
    return outer_auth

def index():
    print("welcome to index page")

@auth(auth_type="local")
def home():
    print("welcome to home page ")
    return "from home"

@auth(auth_type="ldap")
def bbs():
    print("welcome to bbs page")

index()
home()
print(home())#执行结果为空，调用home相当于调用wraper
bbs()