metadata.py 文件源码

def get_entity_group_version(entity_or_key):
  """Return the version of the entity group containing entity_or_key.

  Args:
    entity_or_key: a key or entity whose version you want.

  Returns: The version of the entity group containing entity_or_key. This
    version is guaranteed to increase on every change to the entity
    group. The version may increase even in the absence of user-visible
    changes to the entity group. May return None if the entity group was
    never written to.

    On non-HR datatores, this function returns None.
  """

  eg = db.get(EntityGroup.key_for_entity(entity_or_key))
  if eg:
    return eg.version
  else:
    return None