如何搜索和替换文件中的文本? [英] How to search and replace text in a file?

问题描述

如何使用Python 3搜索和替换文件中的文本?

How do I search and replace text in a file using Python 3?

这是我的代码:

import os
import sys
import fileinput

print ("Text to search for:")
textToSearch = input( "> " )

print ("Text to replace it with:")
textToReplace = input( "> " )

print ("File to perform Search-Replace on:")
fileToSearch  = input( "> " )
#fileToSearch = 'D:\dummy1.txt'

tempFile = open( fileToSearch, 'r+' )

for line in fileinput.input( fileToSearch ):
    if textToSearch in line :
        print('Match Found')
    else:
        print('Match Not Found!!')
    tempFile.write( line.replace( textToSearch, textToReplace ) )
tempFile.close()


input( '\n\n Press Enter to exit...' )

输入文件:

hi this is abcd hi this is abcd
This is dummy text file.
This is how search and replace works abcd

当我在上面的输入文件中搜索并将"ram"替换为"abcd"时，它起了一种魅力.但是，反之亦然，即用"ram"替换"abcd"时，在末尾会留下一些垃圾字符.

When I search and replace 'ram' by 'abcd' in above input file, it works as a charm. But when I do it vice-versa i.e. replacing 'abcd' by 'ram', some junk characters are left at the end.

将"abcd"替换为"ram"

Replacing 'abcd' by 'ram'

hi this is ram hi this is ram
This is dummy text file.
This is how search and replace works rambcd

推荐答案

fileinput 已经支持就地编辑.在这种情况下，它将stdout重定向到文件:

#!/usr/bin/env python3
import fileinput

with fileinput.FileInput(filename, inplace=True, backup='.bak') as file:
    for line in file:
        print(line.replace(text_to_search, replacement_text), end='')

这篇关于如何搜索和替换文件中的文本?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！