code: def fire(self, state):
          
          if self.action is None or self.action == BP_IPDB:
              import ipdb; ipdb.set_trace() #pylint:disable=F0401
          elif self.action == BP_IPYTHON:
              import IPython
              shell = IPython.terminal.embed.InteractiveShellEmbed()
              shell.mainloop(display_banner="This is an ipython shell for you to happily debug your state!\n" + \
                             "The state can be accessed through the variable 'state'. You can\n" +\
                             "make modifications, then exit this shell to resume your analysis.")
          else:
              self.action(state)
docs: Trigger the breakpoint.
  
          :param state:   The state.