code: def flowtable(self):
          
          ftable = dict()
          for table in self.flow_table:
              for k, v in table.items():
                  if k not in ftable:
                      ftable[k] = set(v)
                  else:
                      [ftable[k].add(i) for i in v]
          # convert set to list
          for k in ftable:
              ftable[k] = list(ftable[k])
          return ftable
docs: get a flat flow table globally