计算最大值，最小值，平均值和最大值。使用UDP pinger python 2.7的每个数据包的中值往返时间

Question

我是Python的新学习者。作为家庭作业问题的一部分，我试图计算客户端程序发送的每个数据包的RTT。我能够为客户端编写代码（在stackoverflow社区，Kudos的帮助下），我得到了每个成功数据包的RTT。我已成功计算出最大值，最小值和最小值。平均RTT。但RTT的中位数不起作用。我试图调用函数中位数，它不起作用。给我一个错误： IndexError：列表索引超出范围你能帮我吗？以下是客户端代码：

from socket import *
import datetime
import time

port=input('Port: ')
mylist=[]

def main():
    serverName = 'localhost'
    #port = 2015
    Csocket = socket(AF_INET, SOCK_DGRAM)
    message =' ping' # Client's message to the server
    #data = input("Enter a message in lowercase")

    LastPing = 12 #12 ping messages to be sent
    count = 0
    Csocket.settimeout(1) #timeout after one second
    #print ("Attempting to send " , count , "messages" )

    while count  < LastPing: #while attempting to send to 12 times
        count = count + 1 #incrementing the counter
        startTime = time.time() # Start time when the message from the client is being sent
        print(message , startTime , count) # Printing the clien't message as per required format
        Csocket.sendto(message, (serverName, port)) #sends the message in the socket

        try:
            newmsg, address = Csocket.recvfrom(1024) # Reply message from server in uppercase form
            RTT = ((time.time()) - startTime) #Calculating the Round Trip Time for each packet
            mylist.append(RTT)
            a = sum(mylist)
            b = len(mylist)
            average=a/b
            print "Uppercase Message from the Server: ", newmsg
            print "The Round Trip Time is: " + str(RTT) + " seconds"

        except timeout:
            print" Client's Request timed out\n"
        except Exception as e:
            print e
    print "The program is done"
    print "Stored RTTs are: ", mylist
    print "Total number of successful packets is: ",b
    print "Max RTT is: ",str(max(mylist)) + " seconds"
    print "Min RTT is: ",str(min(mylist)) + " seconds"
    print "Sum of all RTTs is: ",str(a) + " seconds"
    print "Average Round Trip Time is: ",average
#def median(mylist):
    sortedLst = sorted(mylist)
    lstLen = len(mylist)
    index = (lstLen - 1) // 2

    if (lstLen % 2):
        return sortedLst[index]
    else:
        return (sortedLst[index] + sortedLst[index + 1])/2.0
    print "Median RTT is: " (mylist) + "seconds"
    Csocket.close
#median(mylist)

main()