计算重复的IP出现次数

import os,string
m=[]
n={}
s=os.popen('netstat -n')
for i in s.readlines():
        l=string.split(i)
        if len(l)>6:
                pass
        elif len(l)<6:
                pass
        else:
                m.append(l[4])
for elen in m:
        if m.count(elen)==1:
                pass
        else:
                n[elen]=(m.count(elen))
t=sorted(n.items(),key=lambda d: d[1],reverse=True)
 
#for i,k in t:
#       print i,k
for i in t:
        print i[0],i[1]