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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def forum_topic_list(self, title_matches=None, title=None, category_id=None):
 """Function to get forum topics. Parameters: title_matches (str):
 Search body for the given terms. title (str):
 Exact title match. category_id (int):
 Can be: 0, 1, 2 (General, Tags, Bugs & Features respectively). """

        params = {
            'search[title_matches]': title_matches,
            'search[title]': title,
            'search[category_id]': category_id
            }
        return self._get('forum_topics.json', params)