sparse_vector_class.py 文件源码

def __pow__(self, other):
        """Raise each element of sparse vector to a power.

        If power is another sparse vector, compute elementwise power.
        In this latter case, by convention, 0^0 = 0.
        """
        if not isSparseVector(self):
            raise TypeError("Argument must be a SparseVector")
        if isSparseVector(other):
            rv = SparseVector(max(self.n, other.n), {})
            for k in self.values.keys():
                rv[k] = self[k]**other[k]
            return rv
        if not isinstance(other, types.IntType) and \
           not isinstance(other, types.LongType) and \
           not isinstance(other, types.FloatType):
                raise TypeError("Power must be numeric or a sparse vector")
        rv = SparseVector(self.n, {})
        for k in self.values.keys():
            rv[k] = math.pow(self[k], other)
        return rv