Python file management, garbled characters and sorting of passwd files

1. Read and write Files

Read the file:

f = open ("1.txt") Text = F.readlines () print (text)

Write file:

f = open ("2.txt", ' W ') encoding= ' Utf-8 ' F.write ("Hello world!") F.close ()

Code:

Class file ():    encoding =  "Utf-8"     def  Wirtefile (self):         filename = input ("Please input  the file name:  ")         f =  Codecs.open (filename, ' W ', encoding=file.encoding)         while 1:             context = input ("please  input the file context:  ")              if context ==  "EOF":                 break             f.write (context)             f.write ("\ n ")     def readfile(self):         print ("################### #STAT ######################")         readfile = input ("please input your  read file name:  ")         fileread =  Codecs.open (readfile,encoding=file.encoding)         readcontext =  fileread.read ()         print (Readcontext)          print ("################### end ######################")          fileread.close () if __name__ ==  ' __main__ ':     import codecs    file = file ()      File.wirtefile ()     file.readfile ()

Execution process:

Please input the file name:fxq.logPlease input the file Context:hello world! Please input the file Context:my name is fengxiaoqingplease input the file context:i ' m 30Please input the file context: I ' m a bright boy.lplease input the file context:think you very much! Please input the file context:eof################### #STAT ##################### #Please Input your read file Name:fxq.log Hello world! My name is Fengxiaoqingi ' m 30I ' m a bright boy.lthink you very much!################### END ##################### #进程已结束, Exit generation Code 0

2. File methods

File Common methods:

ReadLine ()

ReadLines ()

Next ()

Read ()

Write () writes a string

The writelines () parameter is a sequence, such as a list, that iterates over the file for you

File properties:

F.name

f.closed

f.encoding

F.mode

With usage:

With Codec.open ("1.log", encoding= "Utf-8") as F:print (F.read ())

The garbled problem of 3.python2

In Python2:

Import Sys

Reload (SYS)

Print (sys.getdefaultencoding ())

4.python Sorting of passwd files

Password file:

[[email protected] ~]# cat passwd.txtroot:x:0:0:root:/root:/bin/bashbin:x:1:1:bin:/bin:/ sbin/nologindaemon:x:2:2:daemon:/sbin:/sbin/nologinadm:x:3:4:adm:/var/adm:/sbin/nologinlp:x:4:7:lp:/var/spool/ lpd:/sbin/nologinsync:x:5:0:sync:/sbin:/bin/syncshutdown:x:6:0:shutdown:/sbin:/sbin/shutdownhalt:x:7:0:halt:/ Sbin:/sbin/haltmail:x:8:12:mail:/var/spool/mail:/sbin/nologinoperator:x:11:0:operator:/root:/sbin/nologingames : X:12:100:games:/usr/games:/sbin/nologinftp:x:14:50:ftp user:/var/ftp:/sbin/nologinnobody:x:99:99:nobody :/:/sbin/nologinsystemd-bus-proxy:x:999:997:systemd bus proxy:/:/sbin/nologinsystemd-network:x : 192:192:systemd network management:/:/sbin/nologindbus:x:81:81:system message bus:/:/sbin /nologinpolkitd:x:998:996:user for polkitd:/:/sbin/nologinlibstoragemgmt:x:997:995:daemon  account for libstoragemgmt:/var/run/lsm:/sbin/nologinrpc:x:32:32:rpcbind daemon:/var/lib/ Rpcbind:/sbin/nologintss:x:59:59:account used by the trousers package to sandbox the tcsd  daemon:/dev/null:/sbin/nologinntp:x:38:38::/etc/ntp:/sbin/nologinabrt:x:173:173::/etc/abrt:/sbin/ nologinpostfix:x:89:89::/var/spool/postfix:/sbin/nologinsshd:x:74:74:privilege-separated ssh:/var/empty/ Sshd:/sbin/nologinchrony:x:996:994::/var/lib/chrony:/sbin/nologintcpdump:x:72:72::/:/sbin/nologindockerroot:x : 995:992:docker user:/var/lib/docker:/sbin/nologinsaslauth:x:994:76:saslauthd user:/run/saslauthd:/ Sbin/nologinmailnull:x:47:47::/var/spool/mqueue:/sbin/nologinsmmsp:x:51:51::/var/spool/mqueue:/sbin/nologin

code:

#/usr/bin/env python# -*- coding:utf-8 -*-#  @time    :2018/1/25  22:11#  @Author  :FengXiaoqing#  @file    :uidsort-passwd.pyimport codecsfile  =  "Passwd.txt" sortfile =  "Sortpasswd.txt" filecontext = []sortuid = [] With codecs.open (Sortfile, ' WB ')  as fsort:    with codecs.open (file, encoding= ' Utf-8 ')  as f:        fileContext +=  F.readlines ()         for line in fileContext:             sortuid.append (int (line.split (': ') [2]))         sortuid.sort ()          For uid in sortuid:            for  line in fileconTEXT:              IF STR (UID)  == line.split (":") [2]:                 print (line)                  fsort.write (Line.encode ("Utf-8"))

Python file management, garbled characters and sorting of passwd files