docs: def excepthook (self, etype, evalue, etb):
          """Handle an uncaught exception. We always forward the exception on to
          whatever `sys.excepthook` was present upon setup. However, if the
          exception is a KeyboardInterrupt, we additionally kill ourselves with
          an uncaught SIGINT, so that invoking programs know what happened.
  
          """
          self.inner_excepthook (etype, evalue, etb)
  
          if issubclass (etype, KeyboardInterrupt):
              # Don't try this at home, kids. On some systems os.kill (0, ...)
              # signals our entire progress group, which is not what we want,
              # so we use os.getpid ().
              signal.signal (signal.SIGINT, signal.SIG_DFL)
              os.kill (os.getpid (), signal.SIGINT)