int main(int argc, char *argv[]) { int sock; /* Socket */ struct sockaddr_in broadcastAddr; /* Broadcast Address */ /* Create a best-effort datagram socket using UDP */ if ((sock = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) { perror("socket failed"); exit(EXIT_FAILURE); } /* Construct bind structure */ memset(&broadcastAddr, 0, sizeof(broadcastAddr)); /* Zero out structure */ broadcastAddr.sin_family = AF_INET; /* Internet address family */ broadcastAddr.sin_addr.s_addr = htonl(INADDR_ANY); /* Any incoming interface */ broadcastAddr.sin_port = htons(PORT); /* Broadcast port */ /* Bind to the broadcast port */ if (bind(sock, (struct sockaddr *) &broadcastAddr, sizeof(broadcastAddr)) < 0) { perror("bind failed"); exit(EXIT_FAILURE); } char recvString[MAXRECVSTRING + 1]; int recvStringLen; int count = 0; while(1) { if ((recvStringLen = recvfrom(sock, recvString, MAXRECVSTRING, 0, NULL, 0)) < 0) { perror("recvfrom failed"); exit(EXIT_FAILURE); } switch(recvString[0]) { case '1': printf("S1\n"); break; case '2': printf("S2\n"); break; case '3': printf("S3\n"); break; default: continue; } } close(sock); exit(0); }帮我转换为python语言实现，并且帮我绘制时间和接收到的S1,S2,S3的数量关系图表

以下是将该C语言网络编程例子转换为Python语言实现的代码：

import socket

PORT = 12345
MAXRECVSTRING = 1024

sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
sock.bind(("", PORT))

recvString = ""

count1 = 0
count2 = 0
count3 = 0

while True:
    recvString, addr = sock.recvfrom(MAXRECVSTRING)
    if recvString:
        if recvString[0] == b'1':
            print("S1")
            count1 += 1
        elif recvString[0] == b'2':
            print("S2")
            count2 += 1
        elif recvString[0] == b'3':
            print("S3")
            count3 += 1

sock.close()

关于绘制时间和接收到的S1，S2，S3的数量关系图表，需要使用Python的第三方库matplotlib进行绘图。具体代码如下：

import socket
import matplotlib.pyplot as plt
import numpy as np

PORT = 12345
MAXRECVSTRING = 1024

sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
sock.bind(("", PORT))

recvString = ""

count1 = 0
count2 = 0
count3 = 0

x = []
y1 = []
y2 = []
y3 = []

while True:
    recvString, addr = sock.recvfrom(MAXRECVSTRING)
    if recvString:
        if recvString[0] == b'1':
            print("S1")
            count1 += 1
            x.append(len(x))
            y1.append(count1)
            y2.append(count2)
            y3.append(count3)
        elif recvString[0] == b'2':
            print("S2")
            count2 += 1
            x.append(len(x))
            y1.append(count1)
            y2.append(count2)
            y3.append(count3)
        elif recvString[0] == b'3':
            print("S3")
            count3 += 1
            x.append(len(x))
            y1.append(count1)
            y2.append(count2)
            y3.append(count3)

    plt.clf()
    plt.plot(x, y1, 'r', label='S1')
    plt.plot(x, y2, 'g', label='S2')
    plt.plot(x, y3, 'b', label='S3')
    plt.legend(loc='upper left')
    plt.xlabel('Time')
    plt.ylabel('Count')
    plt.pause(0.1)

sock.close()

这段代码会在每次接收到数据后，将时间和S1、S2、S3的数量分别加入一个数组中，并通过matplotlib库实时绘制折线图。注意需要在代码文件开头添加以下语句来启用matplotlib的交互模式：

import matplotlib
matplotlib.use('TkAgg')