def parse_dataset_name(name, project_id=None):
  """Parses a dataset name into its individual parts.

  Args:
    name: the name to parse, or a tuple, dictionary or array containing the parts.
    project_id: the expected project ID. If the name does not contain a project ID,
        this will be used; if the name does contain a project ID and it does not match
        this, an exception will be thrown.
  Returns:
    A DatasetName named tuple for the dataset.
  Raises:
    Exception: raised if the name doesn't match the expected formats or a project_id was
        specified that does not match that in the name.
  """
  _project_id = _dataset_id = None
  if isinstance(name, basestring):
    # Try to parse as absolute name first.
    m = re.match(_ABS_DATASET_NAME_PATTERN, name, re.IGNORECASE)
    if m is not None:
      _project_id, _dataset_id = m.groups()
    else:
      # Next try to match as a relative name implicitly scoped within current project.
      m = re.match(_REL_DATASET_NAME_PATTERN, name)
      if m is not None:
        groups = m.groups()
        _dataset_id = groups[0]
  elif isinstance(name, dict):
    try:
      _dataset_id = name['dataset_id']
      _project_id = name['project_id']
    except KeyError:
      pass
  else:
    # Try treat as an array or tuple
    if len(name) == 2:
      # Treat as a tuple or array.
      _project_id, _dataset_id = name
    elif len(name) == 1:
      _dataset_id = name[0]
  if not _dataset_id:
    raise Exception('Invalid dataset name: ' + str(name))
  if not _project_id:
    _project_id = project_id

  return DatasetName(_project_id, _dataset_id)
Parses a dataset name into its individual parts.

  Args:
    name: the name to parse, or a tuple, dictionary or array containing the parts.
    project_id: the expected project ID. If the name does not contain a project ID,
        this will be used; if the name does contain a project ID and it does not match
        this, an exception will be thrown.
  Returns:
    A DatasetName named tuple for the dataset.
  Raises:
    Exception: raised if the name doesn't match the expected formats or a project_id was
        specified that does not match that in the name.