python 之 批量替换文件中文本后缀

代码示例如下：

 #!/usr/local/bin python
 import os
 def swapextensions(dir, before, after):
     if before[:1] != '.':
         before = '.'+before
     thelen = -len(before)
     if after[:1] != '.':
         after = '.'+after
     for path, subdir, files in os.walk(dir):
         for oldfile in files:
             if oldfile[thelen:] == before:
                 oldfile = os.path.join(path, oldfile)
                 newfile = oldfile[:thelen] + after
                 os.rename(oldfile, newfile)

 if __name__ == '__main__':
     import sys
     if len(sys.argv) != 4:
         print "Usage: swapext rootdir before after"
         sys.exit(100)
     swapextensions(sys.argv[1], sys.argv[2], sys.argv[3])

可在命令行模式下根据参数进行需要更改替换的后缀！

　　与大家共勉！