python10-装饰器

#装饰器 = 高阶函数+ 函数嵌套+ 函数闭包
#一、高阶函数:1.函数的调用值是函数；2.函数的返回值也是函数
import time
# def bar():
#     time.sleep(1)
#     print('from bar')# def timer(func):
#     start_time = time.time()
#     func()
#     stop_time = time.time()
#     print('函数运行时间是%s' %(stop_time-start_time))
#     return func# bar = timer(bar)
# bar()
#上述实现方式的问题在于，会多运行一次bar()#二、函数嵌套+函数闭包
# def timer(func):
#     def wrapper():
#         start_time = time.time()
#         func()
#         stop_time = time.time()
#         print('函数运行时间是%s' %(stop_time-start_time))
#     return wrapper# @timer              #在函数前面加'@timer', 相当于对函数进行装饰操作：bar = timer(bar)
# def bar():
#     time.sleep(1)
#     print('from bar')
# # bar = timer(bar)
# bar()#三、函数闭包+返回值+参数
# def timer(func):
#     def wrapper(*args,**kwargs):
#         start_time = time.time()
#         res = func(*args,**kwargs)
#         stop_time = time.time()
#         print('函数运行时间是%s' %(stop_time-start_time))
#         return res
#     return wrapper# @timer              #在函数前面加'@timer', 相当于对函数进行装饰操作：bar = timer(bar)
# def bar(name,age,gender):
#     time.sleep(1)
#     print('from bar,name is %s,age is %s,gender is %s' %(name,age,gender))
#     return 'return from bar'
# # bar = timer(bar)
# res = bar('alex',18,'男')
# print(res)#四、解压序列
# l = [1,2,3,4,621,3324,11,254,885,123,'aa','11221',2222]
# a,*_,b = l
# print(a,b)# c = 1
# d = 2
# c,d = d,c
# print(c,d)#给函数加认证
user_list =[{'name':'alex','passwd':'1234'},{'name':'keith','passwd':'12345'},{'name':'mick','passwd':'1222'},{'name':'june','passwd':'11111'},{'name':'haha','passwd':'2345'}
]
user_dic = {'username':None,'login_statu':False}
def auth(func):def wrapper(*args,**kwargs):if user_dic['username'] and user_dic['login_statu']: res = func(*args,**kwargs)return resfor i in range(3):name = input('请输入用户名:')password = input('请输入密码:')for item in user_list:if item['name'] == name and item['passwd'] == password:print('登录成功！')user_dic['username'] = nameuser_dic['login_statu'] = Trueres = func(*args,**kwargs)return resif i < 2:print('登录失败，请重试')else:print('3次登录机会已使用完!')return wrapper@auth
def order_l():print('成功查看订单')return 'dingdan'@auth
def index():print('进入京东')@auth
def produ(name,*args):print('%s 准备买%s' %(name,args))index()
order_l()
produ('alex','wazi','衣服')       #给装饰器加参数
user_list =[{'name':'alex','passwd':'1234'},{'name':'keith','passwd':'12345'},{'name':'mick','passwd':'1222'},{'name':'june','passwd':'11111'},{'name':'haha','passwd':'2345'}
]
user_dic = {'username':None,'login_statu':False}
def auth(func):def wrapper(*args,**kwargs):if user_dic['username'] and user_dic['login_statu']: res = func(*args,**kwargs)return resfor i in range(3):name = input('请输入用户名:')password = input('请输入密码:')for item in user_list:if item['name'] == name and item['passwd'] == password:print('登录成功！')user_dic['username'] = nameuser_dic['login_statu'] = Trueres = func(*args,**kwargs)return resif i < 2:print('登录失败，请重试')else:print('3次登录机会已使用完!')return wrapper@auth
def order_l():print('成功查看订单')return 'dingdan'@auth
def index():print('进入京东')@auth
def produ(name,*args):print('%s 准备买%s' %(name,args))index()
order_l()
produ('alex','wazi','衣服') #文件的增删改查
import os
def file_handler(backward_data,record=None,type='fetch'):if type == 'fetch':with open('http.conf','r',encoding='utf-8') as read_f:ret = []tag = Falsefor read_line in read_f:if read_line == backward_data:tag = Truecontinueelif tag and read_line.startswith('backward'):tag = Falseelif tag:ret.append(read_line)return retif type == 'change':with open('http.conf','r') as read_f, open('http_new.conf','w') as write_f:tag = Falsehas_write = Falsefor read_line in read_f:if read_line == backward_data:tag = Truewrite_f.write(read_line)continueelif not tag:write_f.write(read_line)elif tag and read_line.startswith('backward'):tag = Falsewrite_f.write(read_line)else:if not has_write:for i in record:write_f.write(i)has_write = Trueos.rename('http.conf','http.conf.bak')os.rename('http_new.conf','http.conf')os.remove('http.conf.bak')return
def fetch(data):backward_data = 'backward '+ data + '\n'res = file_handler(backward_data)return resdef add(data):new_data = eval(data)title = new_data[0]['backward']backward_data = 'backward ' + title + '\n'new_record = '%sserver %s %s weight %s max_connections %s\n' %('\t'*2,new_data[0]['record']['server'],new_data[0]['record']['server'],new_data[0]['record']['weight'],new_data[0]['record']['max_connections'])ret = fetch(title)if new_record in ret:return '您要增加的条目已存在'else:ret.insert(0,new_record)res = file_handler(backward_data,record=ret,type='change')returndef change(data):new_data = eval(data)title = new_data[0]['backward']backward_data = 'backward ' + title + '\n'old_record = '%sserver %s %s weight %s max_connections %s\n' %('\t'*2,new_data[0]['record']['server'],new_data[0]['record']['server'],new_data[0]['record']['weight'],new_data[0]['record']['max_connections'])new_record = '%sserver %s %s weight %s max_connections %s\n' %('\t'*2,new_data[1]['record']['server'],new_data[1]['record']['server'],new_data[1]['record']['weight'],new_data[1]['record']['max_connections'])ret = fetch(title)if not ret or old_record not in ret:return '你需要替换的内容不存在'else:for item in ret:if item == old_record:id = ret.index(item)ret[id] = new_recordbreakprint('需要修改为：%s' %ret)res = file_handler(backward_data,record=ret,type='change')returndef delete(data):new_data = eval(data)title = new_data[0]['backward']backward_data = 'backward ' + title + '\n'old_record = '%sserver %s %s weight %s max_connections %s\n' %('\t'*2,new_data[0]['record']['server'],new_data[0]['record']['server'],new_data[0]['record']['weight'],new_data[0]['record']['max_connections'])ret = fetch(title)if not ret or old_record not in ret:print('你需要删除的内容不存在')returnelse:for item in ret:if item == old_record:ret.remove(item)res = file_handler(backward_data,record=ret,type='change')returnif __name__ == '__main__':msg = '''1:增加2:删除3:修改4:查询5:退出
'''dic = {'1':add,'2':delete,'3':change,'4':fetch,'5':exit}while True:print(msg)act = input('请输入你的操作：').strip()if not act: continueelif act == '5':breakelif act not in str(range(1,6)):print('请输入目录中的数字：')else:data = input('请输入需要内容：').strip()res = dic[act](data)print(res)文件样例backward www.oldboy3.orgserver 22.22.22.22 22.22.22.22 weight 100 max_connections 30600server 11.5.5.9 11.5.5.9 weight 100 max_connections 6000server 5.4.1.9 5.4.1.9 weight 100 max_connections 36000server 1.1.1.1 1.1.1.1 weight 888 max_connections 600server 89.5.5.9 89.5.5.9 weight 100 max_connections 30006backward www.oldboy3.org1server 11.5.5.59 11.5.5.59 weight 250 max_connections 8000server 5.4.1.16 5.4.1.16 weight 250 max_connections 800server 88.5.5.56 88.5.5.56 weight 250 max_connections 80server 89.5.5.56 89.5.5.56 weight 250 max_connections 3008[{'backward':'www.oldboy3.org','record':{'server':'88.5.5.9','weight':'100','max_connections':30600}},{'backward':'www.oldboy3.org','record':{'server':'1.1.1.1','weight':'888','max_connections':600}}]
[{'backward':'www.oldboy3.org','record':{'server':'22.22.22.22','weight':'100','max_connections':30600}}]