Custom Range

mediumpy_classes

Implement a Range class (plus its RangeIterator) that mimics the built-in range: an immutable arithmetic sequence.

Range(stop), Range(start, stop), or Range(start, stop, step) — start defaults to 0, step to 1, and step == 0 raises ValueError. Support iteration (re-iterable), len, indexing with negative indices (IndexError when out of range), membership (in) in O(1), and a range-style repr (str(Range(10)) == "range(0, 10)").

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Hints

Hint 1

Store start/stop/step and precompute the length; __getitem__ returns start + index*step (map negative indices via len + index).

Hint 2

Make __contains__ O(1) arithmetic (in-bounds and (key-start) % step == 0); return a fresh iterator from __iter__ so it's re-iterable.