code: def public_ip_prefixes(self):
          
          api_version = self._get_api_version('public_ip_prefixes')
          if api_version == '2018-07-01':
              from .v2018_07_01.operations import PublicIPPrefixesOperations as OperationClass
          elif api_version == '2018-08-01':
              from .v2018_08_01.operations import PublicIPPrefixesOperations as OperationClass
          else:
              raise NotImplementedError("APIVersion {} is not available".format(api_version))
          return OperationClass(self._client, self.config, Serializer(self._models_dict(api_version)), Deserializer(self._models_dict(api_version)))
docs: Instance depends on the API version:
  
             * 2018-07-01: :class:`PublicIPPrefixesOperations<azure.mgmt.network.v2018_07_01.operations.PublicIPPrefixesOperations>`
             * 2018-08-01: :class:`PublicIPPrefixesOperations<azure.mgmt.network.v2018_08_01.operations.PublicIPPrefixesOperations>`