python获取文件后缀名及批量更新目录下文件后缀名的方法

        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)
                print oldfile +' changed to ' + newfile
if __name__ == '__main__':
    import sys
    if len(sys.argv) != 4:
        print 'Usage:swap_extension.py rootdir before after'
        sys.exit(1)
    swap_extensions(sys.argv[1], sys.argv[2], sys.argv[3])
例子:将e:/py/test目录下.php结尾的文件重命名为.py
 
E:py>python_cook e:/py/test .php .py
e:/py/testtest.php changed to e:/py/testtest.py
e:/py/test1.php changed to e:/py/test1.py
e:/py/test2.php changed to e:/py/test2.py

希望本文所述对大家的Python程序设计有所帮助。