def find_lt(self, k):
        'Return last item with a key < k.  Raise ValueError if not found.'
        i = bisect_left(self._keys, k)
        if i:
            return self._items[i-1]
        raise ValueError('No item found with key below: %r' % (k,))
dataset/ETHPy150Open roglew/pappy-proxy/pappyproxy/sortedcollection.py/SortedCollection.find_lt/original