network_speed网卡流量检测

#!/usr/bin/env python#coding:utf-8import sysimport osimport atexitimport timeimport 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)) + "%")#function of Get Memory      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 linedef bytes2human(n):        """            >>> bytes2human(10000)            '9.8 K'            >>> bytes2human(100001221)            '95.4 M'            """        for s in reversed(symbols):                if n >= prefix[s]:        return '%.2f B' % (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 state              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):        if os.name == 'nt':            os.system("cls")        else:            os.system("clear")        """Print stats on screen."""        #print current time #cpu state #memory              print(time.asctime()+" | "+cpu_state+" | "+memory_state)        # totals              print(" NetStates:")        )        print("total packets:                 sent: %-10s     received: %s" % (tot_after.packets_sent,        )        # 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 = 1except (KeyboardInterrupt, SystemExit):        pass