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lang-py
this_is_how_slicing_worksis not the same as python slice. E.G.[0, 1, 2][-5:3:3]will get [0] in python, butlist(this_is_how_slicing_works([0, 1, 2], -5, 3, 3))get [1].range(4)[-200:200:3] == [0, 3]butlist(this_is_how_slicing_works([0, 1, 2, 3], -200, 200, 3)) == [2]. Myif 0 <= i < len(seq):was an attempt to implement "never go outside the sequence" simply but is wrong for step>1. I'll rewrite it later today (with tests).__getitem__(self, key)yourself, you don't have to handle all that. slice objects have a.indices(L)method doing all these adjustments for you, and since range() itself is now cheap and indexable you can simplify it to just:for i in range(L)[key]: ....