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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 _get_item_cache(self, item):
 """Return the cached item, item represents a label indexer."""

        cache = self._item_cache
        res = cache.get(item)
        if res is None:
            values = self._data.get(item)
            res = self._box_item_values(item, values)
            cache[item] = res
            res._set_as_cached(item, self)

            # for a chain
            res._is_copy = self._is_copy
        return res