echo_srv.py


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import socket

HOST = '127.0.0.1' 
PORT = 9095

with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
    s.bind((HOST, PORT))
    s.listen()
    conn, addr = s.accept()
    with conn:
        while True:
            data = conn.recv(1024)
            print('recvd: {} bytes'.format(len(data)))
            if len(data) == 0:
                break;
            conn.sendall(data)