code: def _get_go2pydotnode(self):
          
          go2node = {}
          go2obj = self.gosubdag.go2obj
          get_node = self.pydotnodego.get_node
          for goid in self.get_goids_plt():
              goobj = go2obj[goid]
              node = get_node(goid, goobj)
              go2node[goid] = node
              if goid != goobj.id: # goid is an alias for goobj
                  go2node[goobj.id] = node
          return go2node
docs: Create pydot Nodes.