socket-server.py

# simplest
import socket
from threading import Thread

def response(client, address):
	print(f'Client connected from: {address}')
	while True:
	  # receiving message
		message = client.recv(1024)
		if not message:
			break
	  # send message back to client
		client.send(message)

def echo_server(host='', port=8000):
	# create socket
	with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as sock:
		# reuse the same port if server was interrupted
		sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, True)
		# claim port number
		sock.bind((host, port))
		# listen to requests
		sock.listen()
		# infinite loop
		while True:
			# client connected
			client, address = sock.accept()
			# start new thread for each client
			Thread(target=response, args=(client, address)).start()

if __name__ == '__main__':
	echo_server('', 8000)