Interactive Mode: terminal prompts repeatedly for a url to fetch

def mode_interactive(options):
    """Interactive Mode: terminal prompts repeatedly for a url to fetch"""
    articles = set()
    failures = set()

    url = input('Enter a URL: ')
    while url != '':
        article = _get_article(url=url, bodyLines=options.bodyLines, debug=options.debug)
        if (article):
            articles.add(article)
        else:
            failures.add(url)
        url = input('Enter a URL (press enter to end): ')

    _output(articles, options.outputFile, failures, options.failureFile)