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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 mine_items(self, identifiers, params=None, callback=None):
 """Mine metadata from Archive.org items. :param identifiers: Archive.org identifiers to be mined. :type identifiers: iterable :param params: URL parameters to send with each metadata request. :type params: dict :param callback: A callback function to be called on each :py:class:`aiohttp.client.ClientResponse`. :type callback: func """

        # By default, don't cache item metadata in redis.
        params = {'dontcache': 1} if not params else {}
        requests = metadata_requests(identifiers, params, callback, self)
        yield from self.mine(requests)