def _ith_point(self, i):
        if self.start is S.NegativeInfinity:
            initial = self.stop
        else:
            initial = self.start

        if self.start is S.NegativeInfinity:
            step = -1
        else:
            step = 1

        return initial + i*step
Returns the i'th point of a sequence.
dataset/ETHPy150Open sympy/sympy/sympy/series/sequences.py/SeqBase._ith_point