TCPClient-TCPServer from Computer Networking A Top-Down Approach 6th Edition

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 'From Server:', modifiedSentence
clientSocket.close()

TCPServer.py

from socket import *

serverPort = 12000
serverSocket = socket(AF_INET, SOCK_STREAM)

serverSocket.bind(('127.0.0.1', serverPort))
serverSocket.listen(1)

print 'The server is ready to receive'

while 1:
  connectionSocket, addr = serverSocket.accept()
  sentence = connectionSocket.recv(1024)
  capitalizedSentence = sentence.upper()
  connectionSocket.send(capitalizedSentence)
  connectionSocket.close()