algebra.py 文件源码

def _knownTerms(triple, varsknown, varscount):
    return (len(filter(None, (x not in varsknown and
                              isinstance(
                                  x, (Variable, BNode)) for x in triple))),
            -sum(varscount.get(x, 0) for x in triple),
            not isinstance(triple[2], Literal),
            )