bulkloader.py 文件源码

def GetImplementationClass(kind_or_class_key):
  """Returns the implementation class for a given kind or class key.

  Args:
    kind_or_class_key: A kind string or a tuple of kind strings.

  Return:
    A db.Model subclass for the given kind or class key.
  """
  if isinstance(kind_or_class_key, tuple):
    try:
      implementation_class = polymodel._class_map[kind_or_class_key]
    except KeyError:
      raise db.KindError('No implementation for class \'%s\'' %
                         kind_or_class_key)
  else:
    implementation_class = db.class_for_kind(kind_or_class_key)
  return implementation_class