code: def _ignore_interrupts(self):
          
          signal.signal(signal.SIGINT, signal.SIG_IGN)
          signal.signal(signal.SIGTERM, signal.SIG_IGN)
docs: Ignore interrupt and termination signals. Used as a pre-execution
          function (preexec_fn) for subprocess.Popen calls that pypiper will
          control over (i.e., manually clean up).