Asyncio socket

demo1.py

import asyncio, socket

async def handle_client(client):
    request = None
    while request != 'quit':
        request = (await loop.sock_recv(client, 255)).decode('utf8')
        response = str(eval(request)) + '\n'
        await loop.sock_sendall(client, response.encode('utf8'))
    client.close()

async def run_server():
    while True:
        client, _ = await loop.sock_accept(server)
        loop.create_task(handle_client(client))

server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
server.bind(('localhost', 15555))
server.listen(8)
server.setblocking(False)

loop = asyncio.get_event_loop()
loop.run_until_complete(run_server())

demo2.py

async def handle_client(reader, writer):
    request = None
    while request != 'quit':
        request = (await reader.read(255)).decode('utf8')
        response = str(eval(request)) + '\n'
        writer.write(response.encode('utf8'))

loop = asyncio.get_event_loop()
loop.create_task(asyncio.start_server(handle_client, 'localhost', 15555))
loop.run_forever()