Python TCP客户端/服务端

TCPClient.py

from socket import *
serverName = '127.0.0.1'
serverPort = 12000
clientSocket = socket(AF_INET,SOCK_STREAM)
clientSocket.connect((serverName,serverPort))
sentence = raw_input('input lowercase sentence:')
clientSocket.send(sentence)
modifiedSentence = clientSocket.recv(1024)
print(modifiedSentence)
raw_input() 
clientSocket.close()

TCPServer.py

from socket import *
serverPort = 12000
serverSocket = socket(AF_INET,SOCK_STREAM)
serverSocket.bind(('',serverPort))
serverSocket.listen(1)
print('the server is ready')
while 1:
    connectionSocket, addr = serverSocket.accept()
    sentence = connectionSocket.recv(1204)
    print(sentence)
    capitalizedSentence = sentence.upper()
    connectionSocket.send(capitalizedSentence)
    connectionSocket.close()