Gracefully stop Python Docker container

Some Python libraries like Waitress or my own Spinach expect to be stopped by raising a KeyboardInterrupt. This exception is raised automatically by Python when the interpreter receives a SIGINT.

On the other hand, Docker by default sends a SIGTERM to a container and waits 10 seconds for it to stop before killing it with a SIGKILL. To gracefully stop a Python process running in Docker, KeyboardInterrupt can be raised when receiving a SIGTERM:

import signal

def handle_sigterm(*args):
    raise KeyboardInterrupt()

signal.signal(signal.SIGTERM, handle_sigterm)