文章来自《Python cookbook》.

翻译仅仅是为了个人学习,其它商业版权纠纷与此无关!

-- 61.182.251.99 [DateTime(2004-09-20T19:38:11Z)] TableOfContents

描述

文件中查找替换字符串

问题

You need to change one string into another throughout a file. 替换文件中特定字符串

解决

String substitution is most simply performed by the replace method of string objects. The work here is to support reading from the specified file (or standard input) and writing to the specified file (or standard output):

使用string的replace方法可以简单实现字符串替换操作。从指定文件(或标准输入)读入内容，进行处理，然后写入指定文件(或标准输出)，工作就完成了。

import os, sys

nargs = len(sys.argv)

if not 3 <= nargs <= 5:
    print "usage: %s search_text replace_text [infile [outfile]]" % \
        os.path.basename(sys.argv[0])
else:
    stext = sys.argv[1]
    rtext = sys.argv[2]
    input = sys.stdin
    output = sys.stdout
    if nargs > 3:
        input = open(sys.argv[3])
    if nargs > 4:
        output = open(sys.argv[4], 'w')
    for s in input.xreadlines(  ):
        output.write(s.replace(stext, rtext))
    output.close(  )
    input.close(  )

讨论 Discussion

...

参考 See Also