TCP Socket Programming in Python

from socket import *

serverName = ""
serverPort = 12000

clientSocket = socket(AF_INET, SOCK_STREAM)

# Set up a TCP connection between the client and the server.
clientSocket.connect((serverName, serverPort))

sentence = input("Input lowercase sentence:")

# Without attaching a destination address to the packet,
# it simply hands the bytes of the sentence string to the TCP connection.
clientSocket.send(sentence.encode())

# Characters from the server pile up in order.
modifiedSentence = clientSocket.recv(1024)

print("From Server: ", modifiedSentence.decode())
clientSocket.close()

from socket import *

serverPort = 80
serverSocket = socket(AF_INET, SOCK_STREAM)
serverSocket.bind(("0", serverPort))

# Wait for and accept TCP connections (parameter: max number of queued connections)
serverSocket.listen(1)

print("The server is ready to receive")

while True:
    # Create the connectionSocket socket.
    connectionSocket, addr = serverSocket.accept()
    sentence = connectionSocket.recv(1024).decode()
    capitalizedSentence = sentence.upper()
    connectionSocket.send(capitalizedSentence.encode())
    connectionSocket.close()