Beyond Ctrl-C: The dark corners of Unix signal handling(sunshowers.io)

  from signal import SIGTERM, raise_signal, signal
  import sys # for excepthook
  class Terminate(BaseException):
      pass
  def _excepthook(type, value, traceback):
      if not issubclass(type, Terminate):
          return _prevhook(type, value, traceback)
      # If a Terminate went unhandled, make sure we are killed
      # by SIGTERM as far as wait(2) and friends are concerned.
      signal(SIGTERM, _prevterm)
      raise_signal(SIGTERM)
  _prevhook, sys.excepthook = sys.excepthook, _excepthook
  def terminate(signo=SIGTERM, frame=None):
      signal(SIGTERM, _prevterm)
      raise Terminate
  _prevterm = signal(SIGTERM, terminate)