def add_labels_to_pull_request(repo, pull_request, *labels):
    """Adds a label to a pull request via the issue object
    Args:
    * repo: Repository object
    * pull_request: ShortPullRequest object that exists in repo
    * labels: list(str) of labels to add to the pull request"""
    issue = repo.issue(pull_request.number)
    issue.add_labels(*labels)
