pyzmq Tornado ioloop:如何优雅地处理KeyboardInterrupt？

Question

我可以在pyzmq eventloop中捕获KeyboardInterrupt:

try:
    ioloop.IOLoop.instance().start()
except KeyboardInterrupt:
    pass

但这只会突然停止ioloop.我想检测KeyboardInterrupt并在清理后手动关闭ioloop.我怎样才能做到这一点？

Answer 1

使用该signal模块处理SIGINT:

import signal
from tornado.ioloop import IOLoop

def on_shutdown():
    print('Shutting down')
    IOLoop.instance().stop()

if __name__ == '__main__':
    ioloop = IOLoop.instance()

    signal.signal(signal.SIGINT, lambda sig, frame: ioloop.add_callback_from_signal(on_shutdown))

    ioloop.start()