Python's range... in Python

range-obj.py

import math


class Range(object):

    def __init__(self, start, stop, step):

        self.start = start
        self.stop = stop
        self.step = step

    def __repr__(self):

        return 'Range(%d, %d, %d)' % (self.start, self.stop, self.step)

    def __len__(self):

        return max(0, math.ceil((self.stop - self.start) / self.step))

    def __reversed__(self):

        return Range(self.stop, self.start, -self.step)

    def __getitem__(self, index):

        if not (-len(self) <= index < len(self)):
            raise IndexError('Index out of the range')
        return (self.start + (((len(self) + index) % len(self)) * self.step))