python小练习

# 字符串的反转
def reverse(s):
    rt = ''
    for i in range(len(s) - 1, -1, -1):
        rt += s[i]
    return rt
print(reverse('iop09'))

def reverse2(s):
    li = list(s)
    li.reverse()
    rt = "".join(li)
    return rt
print(reverse2('ffjjmslkdj9'))

def reverse3(s):
    return s[::-1]
print(reverse3('jhbk239'))


def reverse4(s):
    return "".join(reversed(s))
print(reverse4('fmko12222200'))

from functools import reduce
def reverse5(s):
    return reduce(lambda x, y: y + x, s)
print(reverse5('fmko12222200'))

C:UsersMOJIEAppDataLocalProgramsPythonPython36python.exe C:/Users/MOJIE/PycharmProjects/test/tee.py
90poi
9jdklsmjjff
932kbhj
00222221okmf
00222221okmf

Process finished with exit code 0

清理日志文件

#测试机器的磁盘太小，经常报警，要写一个清理日志的脚本，每次运行就把三天之前的日志删除，日志名的格式是xxx.20170623.log
import os,sys,datetime

PATH = os.getcwd() + 'logs1'     #获取日志文件路径 “当前路径+logs”
now = datetime.datetime.now()      #当前时间
delta = datetime.timedelta(days=3) #用来计算3天前的时间
n_days = (now - delta ).strftime('%Y-%m-%d')              #获取三天前的日期

for filename in os.listdir(PATH): #循环每个日志文件
    log_date = filename.split('.')   #以分隔符“.”分割日志文件来截取日期字段2017-11-22
    if log_date[1] < n_days:   
        os.remove(PATH+'\'+filename)     #删除文件(文件路径需要再拼接一下)

#写一个程序，计算min 到max的累加和 如1-100的累加：1+2+3+4+....+100
def AA(min,max):
    a = 1
    res_sum = 0
    for i in range(min,max):
        res_sum = a+res_sum
        a +=1
    return res_sum

print(AA(0,1000))


#计（文件内容）总共写了多少行代码，包括空行和注释，要把代码的行数、空行数、注释行数都统计出来
import string
z = []
S = []
all_str = string.ascii_uppercase + string.ascii_lowercase
print(all_str)
with open('bb.py') as fw:
    CONTEXT = fw.readlines()
    for i in CONTEXT:
        if i.startswith('#'):
            z.append(i)

        for n in all_str:
            if i.startswith(n):
                S.append(i)
        sumH = len(CONTEXT)
        zhusi = len(z)
        daima = len(S)
        konghang = sumH-zhusi-daima
    print('总行数：%s；代码行数：%s；注释行：%s；空行：%s'%(sumH,daima,zhusi,konghang))
    # print('总行数：%s；代码行数：%s；注释行：%s；空行：%s'%(len(CONTEXT),len(S),len(z),(sumH-zhusi-daima))) 或者可以用这种方式直接打印出

# 有一个文件，里面有一些敏感词汇，如下，如果输入这些词，就用**代替，然后输出，例如输入今天没吃饭，碰到一个傻逼，原来那个sb是小明。输出今天没吃饭，碰到一个**，原来那个**是小明
def gl():
    string = input('please enter string:')
    with open('mg',encoding='utf-8') as fw:
        context = fw.readlines()
        for i in context:
            i = i[:-1]
            if i in string:
                string=string.replace(i,'##')
        print(string)
gl()

C:UsersxiuAppDataLocalProgramsPythonPython36-32python.exe C:/Users/xiu/guest/guest/aa.py
please enter string::小明是傻逼，小乐是sb，小红是煞笔，小月是煞比
:小明是##，小乐是##，小红是##，小月是##

Process finished with exit code 0

# 通过不引入第三方变量的方式，交换两个变量的值
a = 1
b = 2

a = a+b  #a = 1+2 = 3
b = a - b #b = 3-2 = 1
a = a - b #a = 3-1 =2
print(b)
print(a)


对比两个字典中不一样的key和valve值

ok_req={
    "version": "9.0.0","is_test": True,"store": "","urs": "","aa":"fff",
    "device": {"os": "android","imei": "99001062198893","device_id": "CQliMWEyYTEzNTYyYzk5MzJmCTJlNmY3Zjkx","mac": "02:00:00:00:00:00","galaxy_tag": "CQliMWEyYTEzNTYyYzk5MzJmCTJlNmY3Zjkx",
        "udid": "a34b1f67dd5797df93fdd8b072f1fb8110fd0db6","network_status": "wifi"},
    "adunit": {"category": "VIDEO","location": "1","app": "7A16FBB6","blacklist": ""},
    "ext_param":{"is_start" : 0,"vId":"VW0BRMTEV"}
}

not_ok={"version": "9.0.0","is_test": True,"urs": "","store": "",
        "device": {"os": "android","imei": "99001062298893","device_id": "CQliMWEyYTEzNTYyYzk5MzJmCTJlNmY3Zjkx","mac": "02:00:00:00:00:00",
      "galaxy_tag": "CQliMWEyYTEzNTYyYzk5MzJmCTJlNmY3Zjkx",
      "udid": "a34b1f67dd5797da93fdd8b072f1fb8110fd0db6",
      "network_status": "wifi"   },
   "adunit": {"category": "VIDEO","location": "1","app": "7A16FBB6","blacklist": ""},
        "ext_param": {"is_start": 0,"vid": "VW0BRMTEV"}
}



okkey = []
notkey = []
okvalue = []
notvalue = []

for i in ok_req.keys():
    if i not in not_ok.keys():
        okkey.append(i)

for i in not_ok.keys():
    if i not in ok_req.keys():
        notkey.append(i)

for i in ok_req.values():
    if i not in not_ok.values():
        okvalue.append(i)

for i in  not_ok.values():
    if i not in ok_req.values():
        notvalue.append(i)

print('ok_req 独有的key:%s'%okkey)
print('not_ok 独有的key:%s'%notkey)
print('ok_req 独有的value：%s'%okvalue)
print('not_ok 独有的values：%s'%notvalue)



有一个存着学生成绩的文件，里面存的是json串，json串读起来特别不直观，需要你写代码把它都写到excel中，并计算出总分和平均分

import xlwt
book = xlwt.Workbook()
sheet = book.add_sheet('score')
list = ['学号','姓名','语文成绩','数学成绩','英语成绩','总分','平均分']
score = {
   "1":["小花",99,100,98.5],
   "2":["小王",90,30.5,95],
   "3":["小明",67.5,49.6,88]
}
for i in range(len(list)):
    sheet.write(0,i,list[i])

for i,v in score.items():    #(行,列)
    i = int(i)
    num = i
    name = v[0]
    yuwen = v[1]
    shuxue = v[2]
    yingyu = v[3]
    sum = yuwen+shuxue+yingyu
    avrag = sum/3
    sheet.write(i,0,num)    #学号
    sheet.write(i,1,name) #姓名
    sheet.write(i,2,yuwen) #y语文成绩
    sheet.write(i,3,shuxue) #数学成绩
    sheet.write(i,4,yingyu) #英语成绩
    sheet.write(i,5,sum)
    sheet.write(i,6,avrag)
book.save('score.xls')

现有字符串a="Im Love python"，需要变成b="python love Im"

a="Im Love python"
aa = (a.split(' '))[::-1]
print(aa)


将"wdnwjfwj we hd 9#sdfekfmew 2011"里的数字取出来相加结果为2020
import string
str = "wdnwjfwj we hd 9#sdfekfmew 2011"
for i in str.split(' ')[3]:     #取出包含数字的段落（9#sdfekfmew）
    number = string.digits    #所有数字
    if i in number:
        res = int(i) + int((str.split(' ')[-1]))  #9+2011
        print(res)