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()

  

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