进度条小工具

import sysdef view_bar(message, num, total):    rate = num / total    rate_num = int(rate * 40)    rate_nums = math.ceil(rate * 100)    r = '\r%s:[%s%s]%d%%\t%d/%d' % (message, ">" * rate_num, " " * (40 - rate_num), rate_nums, num, total,)    sys.stdout.write(r)    sys.stdout.flush()