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How to write python file operations on specified lines

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2019-06-29 14:38:32 4080browse

How to write python file operations on specified lines

常常在操作文件时我们只想在某一行的插入信息,可以先将文件读入列表中,利用列表的下标插入文本,之后再重新写入文件。

但是弊端是,如果文件量太大列表的性能可能不是很高。

python代码:

#coding=utf-8 lines=[] f=open("d:\\1script\\1.txt",'r') #your path! for line in f: lines.append(line) f.close() print lines lines.insert(3,"666\n") #第四行插入666并回车 s=''.join(lines) f=open("d:\\1script\\1.txt",'w+') #重新写入文件 f.write(s) f.close() del lines[:] #清空列表 print lines

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