Python记录11：叠加多个装饰器+有参装饰器

Posted 2021-01-24 同济小孙

# import time
#
# def timmer(func): #func=最原始的index的内存地址
#     def wrapper(*args,**kwargs):
#         start=time.time()
#         res=func(*args,**kwargs)
#         stop=time.time()
#         print(stop - start)
#         return res
#     return wrapper
#
# @timmer #index=timmer(index) #index=wrapper的内存地址
# def index():
#     print(‘index function‘)
#     time.sleep(1)
#
# index(1,2,3,) #wrapper(1,2,3)





# 叠加多个装饰器
#1. 加载顺序: 自下而上
#2. 执行顺序


# import time
#
# def deco1(func1): #func1=wrapper2的内存地址
#     # print(‘deco1运行‘)
#     def wrapper1(*args,**kwargs):
#         print(‘wrapper1‘)
#         res=func1(*args,**kwargs)
#         return res
#     return wrapper1
#
# def deco2(func2): #func2=wrapper3的内存地址
#     # print(‘deco2运行‘)
#     def wrapper2(*args,**kwargs):
#         print(‘wrapper2‘)
#         res=func2(*args,**kwargs)
#         return res
#     return wrapper2
#
# def deco3(func3): #func3=最原始那个index的内存地址
#     # print(‘deco3运行‘)
#     def wrapper3(*args,**kwargs):
#         print(‘wrapper3‘)
#         res=func3(*args,**kwargs)
#         return res
#     return wrapper3
#
#
#       # index=wrapper1
# @deco1 # index=deco1(wrapper2)
# @deco2 # wrapper2=deco2(wrapper3)
# @deco3 # wrapper3=deco3(最原始那个index的内存地址)
# def index():
#     print(‘index function‘)
#     time.sleep(1)
#
# index() #wrapper1()


import time
current_user={‘username‘:None}

def timmer(func): #func=最原始的index的内存地址
    def wrapper1(*args,**kwargs):
        start=time.time()
        res=func(*args,**kwargs) #================>wrapper2
        stop=time.time()
        print(stop - start)
        return res
    return wrapper1

def auth(func):
    def wrapper2(*args,**kwargs):
        if current_user[‘username‘]:
            res = func(*args, **kwargs)
            return res
        name=input(‘username>>: ‘).strip()
        pwd=input(‘password>>: ‘).strip()
        if name == ‘egon‘ and pwd == ‘123‘:
            current_user[‘username‘]=name
            res=func(*args,**kwargs)
            return res
        else:
            print(‘账号密码错误...‘)
    return wrapper2


@timmer
@auth
def index():
    print(‘index function‘)
    time.sleep(1)


index()

import time
current_user={‘username‘:None}

def outter(engine=‘file‘):
    def auth(func):
        def wrapper2(*args,**kwargs):
            # if current_user[‘username‘]:
            #     res = func(*args, **kwargs)
            #     return res
            name=input(‘username>>: ‘).strip()
            pwd=input(‘password>>: ‘).strip()
            if engine == ‘file‘:
                print(‘基于文件的认证‘)
                if name == ‘egon‘ and pwd == ‘123‘:
                    current_user[‘username‘]=name
                    res=func(*args,**kwargs)
                    return res
                else:
                    print(‘账号密码错误...‘)
            elif engine == ‘mysql‘:
                print(‘基于mysql的认证‘)
            elif engine == ‘ldap‘:
                print(‘基于ldap的认证‘)
            else:
                print("不合法的认证源")
        return wrapper2
    return auth

@outter(engine=‘file‘) # 账号密码是来自于文件  index=aaa.txt(index) #index=wrapper2
def index():
    print(‘index function‘)
    time.sleep(1)

@outter(engine=‘mysql‘) # 账号密码是来自于mysql # home=bbb(home) #home=wrapper2
def home(name):
    print(‘home function‘,name)
    time.sleep(1)

index() #wrapper2()
home(‘egon‘) #wrapper2(‘egon‘)