def _AssertProgressKey(self):
    if self.progress_key is None:
      raise BadStateError('%s: Progress key is missing' % str(self))
Raises an Error if the progress key is None.
dataset/ETHPy150Open GoogleCloudPlatform/python-compat-runtime/appengine-compat/exported_appengine_sdk/google/appengine/tools/bulkloader.py/_WorkItem._AssertProgressKey