Simple echo server python socket

client.py

# Echo client program
import socket

HOST = 'localhost'   
PORT =  3003             
with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
    s.connect((HOST, PORT))
    s.sendall(b'Hello, world')
    data = s.recv(1024)
print('Received', repr(data))

server.py

# Echo server program
import socket

HOST = ''                
PORT = 3003              
with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
    s.bind((HOST, PORT))
    s.listen(1)
    conn, addr = s.accept()
    with conn:
        print('Connected by', addr)
        while True:
            data = conn.recv(1024)
            if not data: break
            data = str(data)[2:-1].upper()
            conn.sendall(data.encode())
            s.close()