python检测当前网卡流量信息，用于查看实时网速

可以用来检测是否有挖矿程序在运行的一个子条件

 1 # coding:utf-8
 2 __author__ = 'chenhuachao'
 3 import wmi
 4 import time
 5 import platform
 6 
 7 def get_network_flow(os):
 8     '''监控window平台下网卡的实时的流量信息
 9     通过当前总流量和一秒后的总流量的差值，来统计实时的网卡流量信息;
10     返回的流量单位是KB
11     '''
12     if os == "Windows":
13         c = wmi.WMI()
14         for interfacePerTcp in c.Win32_PerfRawData_Tcpip_TCPv4():
15             sentflow = float(interfacePerTcp.SegmentsSentPersec)  #已发送的流量
16             receivedflow = float(interfacePerTcp.SegmentsReceivedPersec) #接收的流量
17             present_flow = sentflow+receivedflow    #算出当前的总流量
18         time.sleep(1)
19         for interfacePerTcp in c.Win32_PerfRawData_Tcpip_TCPv4():
20            sentflow = float(interfacePerTcp.SegmentsSentPersec)  #已发送的流量
21            receivedflow = float(interfacePerTcp.SegmentsReceivedPersec) #接收的流量
22            per_last_present_flow = sentflow+receivedflow     #算出1秒后当前的总流量
23         present_network_flow = (per_last_present_flow - present_flow)/1024
24         print("当前流量为：{0}KB".format("%.2f"%present_network_flow))
25         return "%.2f"%present_network_flow
26 
27 if __name__ =="__main__":
28     os = platform.system()
29     while 1:
30         flow = get_network_flow(os)
31         print("{0}KB".format(flow))