sparse_vector_class.py 文件源码

def __rpow__(self, other):
        """Use each element of sparse vector as power of base."""
        if not isSparseVector(self):
            raise TypeError("Argument must be a SparseVector")
        if not isinstance(other, types.IntType) and \
           not isinstance(other, types.LongType) and \
           not isinstance(other, types.FloatType):
                raise TypeError("Power must be numeric")
        rv = SparseVector(self.n, {})
        for k in self.values.keys():
            rv[k] = math.pow(other, self[k])
        return rv