code: def show_event_handlers(self, stream=sys.stdout, verbose=0):
          
          lines = ["List of event handlers installed:"]
          for handler in self.event_handlers:
              if verbose:
                  lines.extend(handler.__class__.cls2str().split("\n"))
              else:
                  lines.extend(str(handler).split("\n"))
  
          stream.write("\n".join(lines))
          stream.write("\n")
docs: Print to `stream` the event handlers installed for this flow.