code: def to_match(self):
          
          template = u'({field_name} BETWEEN {lower_bound} AND {upper_bound})'
          return template.format(
              field_name=self.field.to_match(),
              lower_bound=self.lower_bound.to_match(),
              upper_bound=self.upper_bound.to_match())
docs: Return a unicode object with the MATCH representation of this BetweenClause.