def _is_tweet_in_date_range(tweet, start_date, end_date):
    """
    Checks if week_3.tweet is contained in date range.
    Args:
        tweet: A week_3.tweet object.
        start_date: Minimum created_at date (format: '%Y/%m/%d')
        end_date: Maximum created_at date. (format: '%Y/%m/%d')
    Returns:
        A boolean, corresponding to whether the week_3.tweet in contained in the date range.
    Notes:
        Help on the datetime format: https://docs.python.org/2/library/time.html
    """
    return start_date <= tweet.created_at <= end_date