def S3ToGCS(args: 'argparse.Namespace') -> None:
  """Transfer a file from S3 to a GCS bucket.

  Args:
    args (argparse.Namespace): Arguments from ArgumentParser.
  """
  gcst = gcp_st.GoogleCloudStorageTransfer(args.project)
  gcst.S3ToGCS(args.s3_path, args.zone, args.gcs_path)

  logger.info('File successfully transferred.')
Transfer a file from S3 to a GCS bucket.

Args:
args (argparse.Namespace): Arguments from ArgumentParser.
tools/gcp_cli.py