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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _get_vqa_v2_annotations(directory, annotation_url, annotation_filename="vqa_v2.tar.gz"):
 """Extract the VQA V2 annotation files to directory unless it's there."""

  annotation_file = generator_utils.maybe_download_from_drive(
      directory, annotation_filename, annotation_url)
  with tarfile.open(annotation_file, "r:gz") as annotation_tar:
    annotation_tar.extractall(directory)