def last_version(self):
        last_delta = len(self._deltas) - 1
        versiontag = self._deltas[last_delta].versiontag if 0 >= last_delta else None
        return BlockVersion(self._id, last_delta, versiontag)
dataset/ETHPy150Open biicode/bii-server/model/block.py/Block.last_version/swapped operands of `>=`