@classmethod
  def _create_file(cls, filesystem, filename, mime_type, **kwargs):
    """Creates a file and returns its created filename."""
    if filesystem == files.BLOBSTORE_FILESYSTEM:
      return files.blobstore.create(mime_type, filename)
    elif filesystem == files.GS_FILESYSTEM:
      return files.gs.create("/gs/%s" / filename, mime_type, **kwargs)
    else:
      raise errors.BadWriterParamsError(
          "Filesystem '%s' is not supported" % filesystem)
dataset/ETHPy150Open AppScale/appscale/AppServer/google/appengine/ext/mapreduce/output_writers.py/FileOutputWriterBase._create_file/operator `%` -> `/`