code: def fields(self):
          '''A dictionary of fields constructed by this pump'''
          out = dict()
          for operator in self.ops:
              out.update(**operator.fields)
  
          return ouf fields(self):
          '''A dictionary of fields constructed by this pump'''
          out = dict()
          for operator in self.ops:
              out.update(**operator.fields)
  
          return out
docs: A dictionary of fields constructed by this pump