如何正确关闭在initializerr中创建的连接？

Question

我的问题是关于如何在查询后关闭“ conn”对象。查询可以很多。

class MusicAPI(object):

    def __init__(self):
        logger.info("Loading music database ...")
        self.conn = sqlite3.connect('data/music.db')

    def search_by_artist(self, artist, song=None, genre=None):
        assert (artist is not None), "artist must be provided in search_by_artist!"

        query = "SELECT * from musicians where artist == '" + artist + "'"
        if song is not None:
            query += " and song == '" + song + "'"
        if genre is not None:
            query += " and genre == '" + genre + "'"

        results = set()
        cursor = self.conn.execute(query)
        for row in cursor:
            results.add(row[0])

        return results

然后我可以使用API​​进行查询：

class SearchMusic(object):
   def name(self):
      return "search_music"

   def query(self, query_term):
       music_api = MusicAPI()
       r = music_api.search_by_artist(query_term)

如何正确关闭在 init 函数中创建的“ conn”？