code: def get_swagger_spec(settings):
      
      schema_dir = settings.get('pyramid_swagger.schema_directory', 'api_docs/')
      schema_filename = settings.get('pyramid_swagger.schema_file',
                                     'swagger.json')
      schema_path = os.path.join(schema_dir, schema_filename)
      schema_url = urlparse.urljoin('file:', pathname2url(os.path.abspath(schema_path)))
  
      handlers = build_http_handlers(None)  # don't need http_client for file:
      file_handler = handlers['file']
      spec_dict = file_handler(schema_url)
  
      return Spec.from_dict(
          spec_dict,
          config=create_bravado_core_config(settings),
          origin_url=schema_url)
docs: Return a :class:`bravado_core.spec.Spec` constructed from
      the swagger specs in `pyramid_swagger.schema_directory`. If
      `pyramid_swagger.enable_swagger_spec_validation` is enabled the schema
      will be validated before returning it.
  
      :param settings: a pyramid registry settings with configuration for
          building a swagger schema
      :type settings: dict
      :rtype: :class:`bravado_core.spec.Spec`