code: def _serialize_v2(self, macaroon):
          '''Serialize the macaroon in JSON format v2.
  
          @param macaroon the macaroon to serialize.
          @return JSON macaroon in v2 format.
          '''
          serialized = {}
          _add_json_binary_field(macaroon.identifier_bytes, serialized, 'i')
          _add_json_binary_field(binascii.unhexlify(macaroon.signature_bytes),
                                 serialized, 's')
  
          if macaroon.location:
              serialized['l'] = macaroon.location
          if macaroon.caveats:
              serialized['c'] = [
                  _caveat_v2_to_dict(caveat) for caveat in macaroon.caveats
              ]
          return json.dumps(serializedf _serialize_v2(self, macaroon):
          '''Serialize the macaroon in JSON format v2.
  
          @param macaroon the macaroon to serialize.
          @return JSON macaroon in v2 format.
          '''
          serialized = {}
          _add_json_binary_field(macaroon.identifier_bytes, serialized, 'i')
          _add_json_binary_field(binascii.unhexlify(macaroon.signature_bytes),
                                 serialized, 's')
  
          if macaroon.location:
              serialized['l'] = macaroon.location
          if macaroon.caveats:
              serialized['c'] = [
                  _caveat_v2_to_dict(caveat) for caveat in macaroon.caveats
              ]
          return json.dumps(serialized)
docs: Serialize the macaroon in JSON format v2.
  
          @param macaroon the macaroon to serialize.
          @return JSON macaroon in v2 format.