def tweets(url):
    """
    .. py:function:: tweets(url : string)

        Get the number of tweets containing the provided URL.

        This was deprecated as of November 20. 2015. See here:
        https://blog.twitter.com/2015/hard-decisions-for-a-sustainable-platform

        Hence, this function always returns (0,) until implemented otherwise.

        :param str url: The url to query Twitter for.
        :return: the number of tweets
        :rtype: Tuple
        :raises Exception: none.
        .. todo: Implement an own counter for URLs through the recommended
        "filter" Streaming-API.

        Old query:
        query = "http://urls.api.twitter.com/1/urls/count.json?url=%s" % (url)
    """
    return 0,
