def initialize(self):
        super(World, self).initialize()
        match = re.match('^World(\d+)$', self.identifier)
        if not match:
            raise ValueError('Unexpected BTreeDB4 identifier %s' % (self.identifier,))
        self._world_version = int(match.group(1))
dataset/ETHPy150Open blixt/py-starbound/starbound/helpers.py/World.initialize/original