Socket programming #
UDP Client in Python #
SOCK_DGRAM means it will use UDP.
The server’s socket is always open.
UDPClient.py:
from socket import *
serverName = 'hostname'
serverPort = 12000
clientSocket = socket(AF_NET, SOCK_DGRAM)
message = raw_input('Input lowercase sentence:')
clientSocket.sendto(message, (serverName, serverPort))
modifiedMessage, serverAddress = clientSocket.recvfrom(2048)
print modifiedMessage
clientSocket.close()
UDPServer.py
from socket import *
serverPort = 12000
serverSocket = socket(AF_INET, SOCK_DGRAM)
serverSocket.bind(('', serverPort))
print 'The server is ready to receieve'
while 1:
message, clientAddress = serverSocket.recvfrom(2048)
modifiedMessage = message.upper()
serverSocket.sendto(modifiedMessage, clientAddress)
Port numbers should be between 1024-65536.
TCP Client in Python #
SOCK_STREAM means it will use TCP.
TCPClient.py
from socket import *
serverName = 'servername'
serverPort = 12000
clientSocket = socket(AF_NET, SOCK_STREAM)
clientSocket.connect((serverName, serverPort))
sentence = raw_input('Input a 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(('', serverPort))
serverSocket.listen(1)
print 'The server is ready'
while 1:
connectionSocket, addr = serverSocket.accept()
sentence = connectionSocket.recv(1024)
capitalizedSentence = sentence.upper()
connectionSocket.send(capitalizedSentence)
connectionSocket.close()
