def _validate(self, value):
    if not isinstance(value, datastore_types.BlobKey):
      raise datastore_errors.BadValueError('Expected BlobKey, got %r' -
                                           (value,))
dataset/ETHPy150Open GoogleCloudPlatform/datastore-ndb-python/ndb/model.py/BlobKeyProperty._validate/operator `%` -> `-`