python腳本替換指定行實(shí)現(xiàn)步驟

       本文主要介紹了Python的腳本替換，由于工作的需要，必須對(duì)日志系統(tǒng)進(jìn)行更新，這里在網(wǎng)上搜索到一篇文章比較不錯(cuò)，這里記錄下，大家可以參考下，

工作中需要遷移代碼，并把原來的日志系統(tǒng)更新到現(xiàn)在的格式，原來獲取log的格式是

AuctionPoolLoggerUtil.getLogger() 

現(xiàn)在獲取log的格式是：

LoggerFactory.getLogger(XXXXX.class) 

這里的XXXXX需要替換為當(dāng)前的類名。如果這樣的java文件不多還好，可以一個(gè)個(gè)人肉替換。一旦這樣的文件很多，特別是遷移過來大量的文件時(shí)，你就會(huì)發(fā)現(xiàn)簡(jiǎn)直是一場(chǎng)災(zāi)難。其實(shí)我們發(fā)現(xiàn)上面的工作很多是機(jī)械單調(diào)的。ide中的替換功能不能做到的是把XXXXX替換成當(dāng)前的類名。而python很容易處理文本，利用正則表達(dá)式可以比較方便的拿到類名，然后替換掉xxxxx就可以了。

實(shí)現(xiàn)代碼：

import fileinput import os import re  __author__ = 'ykdsg'  packDir='/Users/ykdsg/svn_workspace/auctionplatform/misc_refactory/auctionplatform/ap-biz/src/main/java/com/yk/misccenter' #查找class name findClassNameP=re.compile(r"(?<=class/s)/w*") findXP=re.compile(r"XXXXX")   def processDirectory(args,dirname,filenames):   # print 'Directory',dirname   for filename in filenames:      if os.path.splitext(filename)[1]=='.java':       # print 'file',filename       fullFileUrl=dirname+ "/"+filename       fileObj=open(fullFileUrl)       className=''       # Optional in-place filtering: if the keyword argument inplace=1 is passed to fileinput.input() or to       # the FileInput constructor, the file is moved to a backup file and standard output is directed to the       # input file (if a file of the same name as the backup file already exists, it will be replaced silently)       # . This makes it possible to write a filter that rewrites its input file in place. If the backup       # parameter is given (typically as backup='.<some extension>'), it specifies the extension for the       # backup file, and the backup file remains around; by default, the extension is '.bak' and it is deleted       # when the output file is closed. In-place filtering is disabled when standard input is read.       for line in fileinput.input(fullFileUrl, inplace=1):         matchClass = findClassNameP.search(line)         if matchClass:           className = matchClass.group()         matchX=findXP.search(line)         if matchX:           #print 后面需要有, 否則會(huì)出現(xiàn)多余的空行           print line.replace('XXXXX',className),         else:           print line,   def search():   os.path.walk(packDir,processDirectory,None)  if __name__ == '__main__':   search() 

上面的腳本中大部分是fileinput.input的注釋，就是說了inplace=1其實(shí)就是把源文件的內(nèi)容放到緩存區(qū)，然后直接將內(nèi)容寫入源文件