code: def delete(self, **kwargs):
          
          if not kwargs:
              return 0
          
          affected = self.where(**kwargs)
          self.remove_many(affected)
          return len(affected)
docs: Deletes matching objects from the table, based on given
             named parameters.  If multiple named parameters are given, then
             only objects that satisfy all of the query criteria will be removed.
             @param kwargs: attributes for selecting records, given as additional 
                named arguments of the form C{attrname="attrvalue"}.
             @return: the number of objects removed from the table