Python实现本机网络流量监视器

本文要点在于Python扩展库psutil提供的方法net_io_counters()可以查看本机网络收发包和流量情况，稍加封装就可以实现流量监视器。

import time
import psutil
def main():
    #初始流量情况
    traffic_io = psutil.net_io_counters()[:2]
    while True:
        #0.5秒之后再次获取流量情况
        time.sleep(0.5)
        traffic_ioNew = psutil.net_io_counters()[:2]
        diff = traffic_ioNew[0]-traffic_io[0], traffic_ioNew[1]-traffic_io[1]
        #记录新的流量情况，以便下次比较和计算
        traffic_io = traffic_ioNew
        #乘2是因为0.5秒查看一次，除1024是为了把单位变成kb
        diff = tuple(map(lambda x: x*2/1024, diff))
        message = '↑{0[0]:#f} kbytes/s\t↓{0[1]:#f} kbytes/s'.format(diff)
        print(message)
main()

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