tcp_echo_client.py

import asyncio

async def tcp_echo_client(message, loop):
    reader, writer = await asyncio.open_connection(
        '127.0.0.1',
        8888,
        loop=loop)
    print(("Send: %r" % message))
    writer.write(message.encode())

    data = await reader.read(100)
    print(("Received: %r" % data.decode()))

    print("Close the socket.")
    writer.close()

message = "hello, world!"
loop = asyncio.get_event_loop()
loop.run_until_complete(tcp_echo_client(message, loop))
loop.close()