code: def _serialize_v1(self, macaroon):
          '''Serialize the macaroon in JSON format v1.
  
          @param macaroon the macaroon to serialize.
          @return JSON macaroon.
          '''
          serialized = {
              'identifier': utils.convert_to_string(macaroon.identifier),
              'signature': macaroon.signature,
          }
          if macaroon.location:
              serialized['location'] = macaroon.location
          if macaroon.caveats:
              serialized['caveats'] = [
                  _caveat_v1_to_dict(caveat) for caveat in macaroon.caveats
              ]
          return json.dumps(serializedf _serialize_v1(self, macaroon):
          '''Serialize the macaroon in JSON format v1.
  
          @param macaroon the macaroon to serialize.
          @return JSON macaroon.
          '''
          serialized = {
              'identifier': utils.convert_to_string(macaroon.identifier),
              'signature': macaroon.signature,
          }
          if macaroon.location:
              serialized['location'] = macaroon.location
          if macaroon.caveats:
              serialized['caveats'] = [
                  _caveat_v1_to_dict(caveat) for caveat in macaroon.caveats
              ]
          return json.dumps(serialized)
docs: Serialize the macaroon in JSON format v1.
  
          @param macaroon the macaroon to serialize.
          @return JSON macaroon.