asyncio server and client to handle input from console

You could consider using aioconsole.ainput:

from aioconsole import ainput

async def some_coroutine():
    line = await ainput(">>> ")
    [...]

The project is available on PyPI.

another way is just to use run_in_executor

so something like

from functools import partial
from concurrent.futures.thread import ThreadPoolExecutor

async def f():
    rie = partial(asyncio.get_event_loop().run_in_executor, ThreadPoolExecutor(1))
    while True:
        await rie(input)