def DtoTab(dsrc, dtarget):

    try:

        for item in os.listdir(dsrc):

            if os.path.isfile(item):

                print('ok')

def DtoTab(dsrc, dtarget):

    try:

        for item in os.listdir(dsrc):

            fullfilename=os.path.join(dsrc,item)

            if os.path.isfile(fullfilename) and item.endswith('.txt'):

                print('开始处理文件：{}'.format(item))

                dfilename = os.path.join(dtarget,item)

                ftarget = codecs.open(dfilename, 'w', encoding='utf-8')

                icount = 0

                for line in open(fullfilename, encoding='utf8'):

                    line = line.replace(',', '\t')

                    icount = icount + 1

                    ftarget.write(line)

                ftarget.close()

                print('处理完毕文件：{}；总计{}行'.format(item, icount))

    except Exception as e:

        print('出错啦，错误信息是：{}'.format(traceback.format_exc()))