字符串操作以及打印 —— 实现上传下载的进度条功能

import sys

def processBar(num, total):
    rate = num / total
    rate_num = int(rate * 100)
    if rate_num == 100:
        r = '\r%s>%d%%\n' % ('=' * rate_num, rate_num,)
    else:
        r = '\r%s>%d%%' % ('=' * rate_num, rate_num,)
    sys.stdout.write(r)
    sys.stdout.flush

processBar(10,100)