python正则抓取(2)

如下所示，在BASH中使用 grep bytes | awk  '{print $2}'| awk -F":" '{print $2}') 就可以抓出RX bytes:719757611，同样在python中如何抓取呢
    eth0      Link encap:Ethernet  HWaddr 6C:F0:49:A2:08:07  
              inet addr:192.168.1.216  Bcast:192.168.1.255  Mask:255.255.255.0
              inet6 addr: fe80::6ef0:49ff:fea2:807/64 Scope:Link
              UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
              RX packets:6421518 errors:0 dropped:0 overruns:0 frame:0
              TX packets:57581 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:1000
           [fly]   RX bytes:719757611 (686.4 MiB)  TX bytes:7515290 (7.1 MiB)[/fly]
              Interrupt:233 Base address:0xc000
    #-*- coding: utf-8 -*-
    #!/usr/bin/python

    import os,re

    p=re.compile("RX bytes:\d+")

    for i in os.popen('ifconfig'):
            m=p.findall(i.strip())
            if m:
                    print m[0]