Why does the asyncio's event loop suppress the KeyboardInterrupt on Windows?

Question

I have this really small test program which does nothing apart from a executing an asyncio event loop:

import asyncio asyncio.get_event_loop().run_forever() 

When I run this program on Linux and press Ctrl+C, the program will terminate correctly with a KeyboardInterrupt exception. On Windows pressing Ctrl+C does nothing (tested with Python 3.4.2). A simple inifinite loop with time.sleep() raises the KeyboardInterrupt correctly even on Windows:

import time while True:     time.sleep(3600) 

Why does the asyncio's event loop suppress the KeyboardInterrupt on Windows?

Answer 1

There is workaround for Windows. Run another corouting which wake up loop every second and allow loop to react on keyboard interrupt

Example with Echo server from asyncio doc

async def wakeup():     while True:         await asyncio.sleep(1)  loop = asyncio.get_event_loop() coro = loop.create_server(EchoServerClientProtocol, '127.0.0.1', 8888) server = loop.run_until_complete(coro)  # add wakeup HACK loop.create_task(wakeup())  try:     loop.run_forever() except KeyboardInterrupt:     pass