schemadata.py 文件源码

def derived_from(self, identity: QualName) -> MutableSet[QualName]:
        """Return list of identities transitively derived from `identity`."""
        try:
            res = self.identity_adjs[identity].derivs
        except KeyError:
            return set()
        for id in res.copy():
            res |= self.derived_from(id)
        return res