TCP IP Socket programming using Python

This blog article shows you how to create a simple TCP listener and client. This code sets up a basic TCP server using Python’s socket module. Here’s a step-by-step explanation:

#1. Import the socket module:
import socket

#2.  Create a TCP socket
server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

3. # Bind the socket to a specific address and port
server_socket.bind((‘localhost’, 18999))

4. # Listen for incoming connections
server_socket.listen()
print(“Server is listening on port 18999…”)
try:
     while True:
        5.  # Accept a client connection
         client_socket, client_address = server_socket.accept()
         print(f”Accepted connection from {client_address[0]}:{client_address[1]}”)
         6. # Receive data from the client
         data = client_socket.recv(1024)
         print(f”Received data: {data.decode()}”)
        7.  # Send a response back to the client
         response = “Hello from the server!”
         client_socket.send(response.encode())
        8. # Close the client connection
         client_socket.close()
except KeyboardInterrupt:
     print(“Server stopped by user”)

9. # Close the server socket
server_socket.close()

• while True: Creates an infinite loop to continuously accept connections.
• server_socket.accept(): Waits for an incoming connection. When a client connects, it returns a new socket object (client_socket) and the address of the client (client_address).
• print(f”Accepted connection from {client_address[0]}:{client_address[1]}”): Prints the IP address and port number of the connected client.

Also: Create a Selection Sort in C# using GitHub Copilot

The following script is a simple TCP client that connects to a server, sends a message, and receives a response. Here’s a step-by-step explanation:

# 1. Import the socket module:
import socket

# 2. Define the server’s IP address and port
server_ip = ‘localhost’
server_port = 18999

# 3. Create a TCP socket
client_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
try:
     # 4.  Connect to the server
     client_socket.connect((server_ip, server_port))
     # 5. Send the message to the server
     message = ‘Hello’
     client_socket.sendall(message.encode())
     # 6. Receive the response from the server
     response = client_socket.recv(1024)
     print(‘Response from server:’, response.decode())

finally:
     # 7. Close the socket
     client_socket.close()

The script follows a typical pattern for TCP client communication: create a socket, connect to a server, send data, receive data, and close the socket.

Source code download: https://github.com/chanmmn/python/tree/main/2024/PythonTCPProgaming?WT.mc_id=DP-MVP-36769

Reference: https://realpython.com/python-sockets/?WT.mc_id=DP-MVP-36769