由于psutil已更新到3.0.1版本，最新的代码如下：

#!/usr/bin/env python

import os
import time
import sys
import atexit
import psutil

#print "Welcome,current system is",os.name," 3 seconds late start to get data"
time.sleep(3)

line_num = 1

#function of Get cpu state
def getCPUstate(interval=1):
  return (" CPU:"+str(psutil.cpu_percent(interval))+"%")

def getMemorystate():
  phymem = psutil.virtual_memory()
  line = "Memory: %5s%% %6s/%s"%(
      phymem.percent,
      str(int(phymem.used/1024/1024))+"M",
      str(int(phymem.total/1024/1024))+"M"
      )
  return line
def bytes2human(n):
  """
  >>>bytes2human(10000)
  '9.8k'
  >>>bytes2human(100001221)
  '95.4M'
  """
  symbols = ('K','M','G','T','P','E','Z','Y')
  prefix = {}
  for i ,s in enumerate(symbols):
    prefix[s] = 1 << (i+1)*10
  for s in reversed(symbols):
    if n >=prefix[s]:
      value = float(n) / prefix[s]
      return '%.2f %s'%(value,s)
  return '%.2fB'%(n)
def poll(interval):
  """Retrieve raw stats within an interval window."""
  tot_before = psutil.net_io_counters()
  pnic_before = psutil.net_io_counters(pernic=True)
  #sleep some time
  time.sleep(interval)
  tot_after = psutil.net_io_counters()
  pnic_after = psutil.net_io_counters(pernic=True)
  #get cpu stats
  cpu_state = getCPUstate(interval)
  #get memory
  memory_state = getMemorystate()
  return (tot_before,tot_after,pnic_before,pnic_after,cpu_state,memory_state)
def refresh_window(tot_before,tot_after,pnic_before,pnic_after,cpu_state,memory_state):
  """print stats on screen"""
  #print current time,cpu state,memory
  print (time.asctime() +" | "+cpu_state+" | "+
      memory_state)
  #total
  print(" NetStates:")
  print(" total bytes: sent: %-10s received: %s"%(\
    bytes2human(tot_after.bytes_sent), \
    bytes2human(tot_after.bytes_recv)))
  print( " total packets: sent: %-10s received: %s"%(\
    tot_after.packets_sent,\
    tot_after.packets_recv))
  # per-network interface details: let's sort network interfaces so  
  # that the ones which generated more traffic are shown first
  print( " ")
  nic_names = pnic_after.keys()
  #nic_names.sort(key=lambda x: sum(pnic_after[x]), reverse=True)
  for name in nic_names:
    stats_before = pnic_before[name]
    stats_after = pnic_after[name]
    templ = "%-15s %15s %15s"  
    print(templ % (name, "TOTAL", "PER-SEC")) 
    print(templ % (
      "bytes-sent",  
      bytes2human(stats_after.bytes_sent), 
      bytes2human(stats_after.bytes_sent - stats_before.bytes_sent) +
      '/s', 
      ))
    print(templ % (  
      "bytes-recv",  
      bytes2human(stats_after.bytes_recv),  
      bytes2human(stats_after.bytes_recv- stats_before.bytes_recv)
      + '/s',  
      ))
    print(templ % ( 
      "pkts-sent",
      stats_after.packets_sent,
      stats_after.packets_sent - stats_before.packets_sent,
      ))
    print((templ %(
      "pkts-recv", 
      stats_after.packets_recv,
      stats_after.packets_recv - stats_before.packets_recv,
      )))
    print( " ")
try:
  interval = 0
  while 1:
    args = poll(interval)
    refresh_window(*args)
    interval = 1
except (KeyboardInterrupt,SystemExit):
  pass