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  • The Three Day

    函数基础-练习

     1 #1、写函数,,用户传入修改的文件名,与要修改的内容,执行函数,完成批了修改操作
     2 # def modify_file(filename,old,new):
     3 #     import os
     4 #     with open(filename,'r',encoding='utf-8') as read_f,
     5 #         open('.bak.swap','w',encoding='utf-8') as write_f:
     6 #         for line in read_f:
     7 #             if old in line:
     8 #                 line=line.replace(old,new)
     9 #             write_f.write(line)
    10 #     os.remove(filename)
    11 #     os.rename('.bak.swap',filename)
    12 #2、写函数,计算传入字符串中【数字】、【字母】、【空格] 以及 【其他】的个数
    13 # def check_str(msg):
    14 #     res={
    15 #         'al_num':0,
    16 #         'spance_num':0,
    17 #         'digit_num':0,
    18 #         'others_num':0,
    19 #     }
    20 #
    21 #     for s in msg:
    22 #         if s.isdigit():
    23 #             res['al_num']+=1
    24 #         elif s.isspace():
    25 #             res['spance_num']+=1
    26 #         elif s.isalpha():
    27 #             res['digit_num']+=1
    28 #         else:
    29 #             res['others_num']+=1
    30 #     return res
    31 # res=check_str('hello name:aSB passowrd:alex3714')
    32 # print(res)
    33 #3.判断用户传入的对象(字符串、列表、元组)长度是否大于5。
    34 # def funcl(s,li,tup):
    35 #     s=len(s)
    36 #     i=len(li)
    37 #     o=len(tup)
    38 #     if s>5:
    39 #         print('yes')
    40 #     else:
    41 #         print('no')
    42 #     if i>5:
    43 #         print('yes')
    44 #     else:
    45 #         print('no')
    46 #     if o>5:
    47 #         print('yes')
    48 #     else:
    49 #         print('no')
    50 #     return(s,i,o)
    51 # m=funcl('fdsfwefewwe',(34,45,56),[11,222,33])
    52 # print(m)
    53 #4.检查传入列表的长度,如果大于2,那么仅保留前两个长度的内容,并将新内容返回给调用者
    54 
    55 # def funcl(seq):
    56 #     if len(seq)>2:
    57 #         seq=seq[0:2]
    58 #     return sequh
    59 # print(funcl([1,2,3,4]))
    60 
    61 #5.检查获取传入列表或元组对象的所有奇数位索引对应的元素,并将其作为新列表返回给调用者
    62 # def func1(seq):
    63 #     return seq[::2]
    64 # print(func1([1,2,3,4,5,6]))
    65 #
    66 # def func2(dic):
    67 #     d={}
    68 #     for k,v in dic.items():
    69 #         if len(v)>2:
    70 #             d[k]=v[0:2]
    71 #     return d
    72 # print(func2({'k1':'werwerewr','k2':[1,2,3,4],'k3':('a','b','c')}))
     1 # 6、写函数,检查字典的每一个value的长度,如果大于2,那么仅保留前两个长度的内容,并将新内容返回给调用者。
     2 # dic = {"k1": "v1v1", "k2": [11,22,33,44]}
     3 # PS:字典中的value只能是字符串或列表
     4 # def func3(dic):
     5 #     d={}
     6 #     for k,v in dic.items():
     7 #         if len(v) > 2:
     8 #             d[k]=v[0:2]
     9 #     return d
    10 # print(func3({'k1':'abcdef','k2':[1,2,3,4],'k3':('a','b','c')}))

    装饰器-练习

    四:编写装饰器,为多个函数加上认证的功能(用户的账号密码来源于文件),要求登录成功一次,后续的函数都无需再输入用户名和密码
    注意:从文件中读出字符串形式的字典,可以用eval('{"name":"egon","password":"123"}')转成字典格式
    
    五:编写装饰器,为多个函数加上认证功能,要求登录成功一次,在超时时间内无需重复登录,超过了超时时间,则必须重新登录
    
    六:编写下载网页内容的函数,要求功能是:用户传入一个url,函数返回下载页面的结果
    
    七:为题目五编写装饰器,实现缓存网页内容的功能:
    具体:实现下载的页面存放于文件中,如果文件内有值(文件大小不为0),就优先从文件中读取网页内容,否则,就去下载,然后存到文件中
    
    扩展功能:用户可以选择缓存介质/缓存引擎,针对不同的url,缓存到不同的文件中
    
    八:还记得我们用函数对象的概念,制作一个函数字典的操作吗,来来来,我们有更高大上的做法,在文件开头声明一个空字典,然后在每个函数前加上装饰器,完成自动添加到字典的操作
    
    九 编写日志装饰器,实现功能如:一旦函数f1执行,则将消息2017-07-21 11:12:11 f1 run写入到日志文件中,日志文件路径可以指定
    注意:时间格式的获取
    import time
    time.strftime('%Y-%m-%d %X')
    

      

    #题目四:
    db='db.txt'
    login_status={'user':None,'status':False}
    def auth(auth_type='file'):
        def auth2(func):
            def wrapper(*args,**kwargs):
                if login_status['user'] and login_status['status']:
                    return func(*args,**kwargs)
                if auth_type == 'file':
                    with open(db,encoding='utf-8') as f:
                        dic=eval(f.read())
                    name=input('username: ').strip()
                    password=input('password: ').strip()
                    if name in dic and password == dic[name]:
                        login_status['user']=name
                        login_status['status']=True
                        res=func(*args,**kwargs)
                        return res
                    else:
                        print('username or password error')
                elif auth_type == 'sql':
                    pass
                else:
                    pass
            return wrapper
        return auth2
    
    @auth()
    def index():
        print('index')
    
    @auth(auth_type='file')
    def home(name):
        print('welcome %s to home' %name)
    
    
    # index()
    # home('egon')
    
    #题目五
    import time,random
    user={'user':None,'login_time':None,'timeout':0.000003,}
    
    def timmer(func):
        def wrapper(*args,**kwargs):
            s1=time.time()
            res=func(*args,**kwargs)
            s2=time.time()
            print('%s' %(s2-s1))
            return res
        return wrapper
    
    
    def auth(func):
        def wrapper(*args,**kwargs):
            if user['user']:
                timeout=time.time()-user['login_time']
                if timeout < user['timeout']:
                    return func(*args,**kwargs)
            name=input('name>>: ').strip()
            password=input('password>>: ').strip()
            if name == 'egon' and password == '123':
                user['user']=name
                user['login_time']=time.time()
                res=func(*args,**kwargs)
                return res
        return wrapper
    
    @auth
    def index():
        time.sleep(random.randrange(3))
        print('welcome to index')
    
    @auth
    def home(name):
        time.sleep(random.randrange(3))
        print('welcome %s to home ' %name)
    
    index()
    home('egon')
    
    #题目六:略
    #题目七:简单版本
    import requests
    import os
    cache_file='cache.txt'
    def make_cache(func):
        def wrapper(*args,**kwargs):
            if not os.path.exists(cache_file):
                with open(cache_file,'w'):pass
    
            if os.path.getsize(cache_file):
                with open(cache_file,'r',encoding='utf-8') as f:
                    res=f.read()
            else:
                res=func(*args,**kwargs)
                with open(cache_file,'w',encoding='utf-8') as f:
                    f.write(res)
            return res
        return wrapper
    
    @make_cache
    def get(url):
        return requests.get(url).text
    
    
    # res=get('https://www.python.org')
    
    # print(res)
    
    #题目七:扩展版本
    import requests,os,hashlib
    engine_settings={
        'file':{'dirname':'./db'},
        'mysql':{
            'host':'127.0.0.1',
            'port':3306,
            'user':'root',
            'password':'123'},
        'redis':{
            'host':'127.0.0.1',
            'port':6379,
            'user':'root',
            'password':'123'},
    }
    
    def make_cache(engine='file'):
        if engine not in engine_settings:
            raise TypeError('egine not valid')
        def deco(func):
            def wrapper(url):
                if engine == 'file':
                    m=hashlib.md5(url.encode('utf-8'))
                    cache_filename=m.hexdigest()
                    cache_filepath=r'%s/%s' %(engine_settings['file']['dirname'],cache_filename)
    
                    if os.path.exists(cache_filepath) and os.path.getsize(cache_filepath):
                        return open(cache_filepath,encoding='utf-8').read()
    
                    res=func(url)
                    with open(cache_filepath,'w',encoding='utf-8') as f:
                        f.write(res)
                    return res
                elif engine == 'mysql':
                    pass
                elif engine == 'redis':
                    pass
                else:
                    pass
    
            return wrapper
        return deco
    
    @make_cache(engine='file')
    def get(url):
        return requests.get(url).text
    
    # print(get('https://www.python.org'))
    print(get('https://www.baidu.com'))
    
    
    #题目八
    route_dic={}
    
    def make_route(name):
        def deco(func):
            route_dic[name]=func
        return deco
    @make_route('select')
    def func1():
        print('select')
    
    @make_route('insert')
    def func2():
        print('insert')
    
    @make_route('update')
    def func3():
        print('update')
    
    @make_route('delete')
    def func4():
        print('delete')
    
    print(route_dic)
    
    
    #题目九
    import time
    import os
    
    def logger(logfile):
        def deco(func):
            if not os.path.exists(logfile):
                with open(logfile,'w'):pass
    
            def wrapper(*args,**kwargs):
                res=func(*args,**kwargs)
                with open(logfile,'a',encoding='utf-8') as f:
                    f.write('%s %s run
    ' %(time.strftime('%Y-%m-%d %X'),func.__name__))
                return res
            return wrapper
        return deco
    
    @logger(logfile='aaaaaaaaaaaaaaaaaaaaa.log')
    def index():
        print('index')
    
    index()
    

      

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  • 原文地址:https://www.cnblogs.com/yinfutao/p/8084576.html
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