def _get_data_file(self, filename):
    if not filename in self.data_files:
      f = tempfile.TemporaryFile()
      self.data_files[filename] = f
      return f
    return self.data_files[filename]
Get a temp data file for a file.
dataset/ETHPy150Open AppScale/appscale/AppServer/google/appengine/api/files/file_service_stub.py/BlobstoreStorage._get_data_file