yaml_object.py 文件源码

def BuildSingleObject(default_class, stream, loader=yaml.loader.SafeLoader):
  """Build object from stream.

  Handles the basic case of loading a single object from a stream.

  Args:
    default_class: Class that is instantiated upon the detection of a new
      document.  An instance of this class will act as the document itself.
    stream: String document or open file object to process as per the
      yaml.parse method.  Any object that implements a 'read()' method which
      returns a string document will work with the YAML parser.
    loader_class: Used for dependency injection.
  """
  definitions = BuildObjects(default_class, stream, loader)

  if len(definitions) < 1:
    raise yaml_errors.EmptyConfigurationFile()
  if len(definitions) > 1:
    raise yaml_errors.MultipleConfigurationFile()
  return definitions[0]