How to gracefully terminate an asyncio script with Ctrl-C?

Use signal handlers:

import asyncio
from signal import SIGINT, SIGTERM

async def main_coro():
    try:
        await awaitable()
    except asyncio.CancelledError:
        do_cleanup()

if __name__ == "__main__":
    loop = asyncio.get_event_loop()
    main_task = asyncio.ensure_future(main_coro())
    for signal in [SIGINT, SIGTERM]:
        loop.add_signal_handler(signal, main_task.cancel)
    try:
        loop.run_until_complete(main_task)
    finally:
        loop.close()