2_indexing.md

Indexing

Unlike most programming languages, Python supports negative indexing. Negative indexing starts from the back of the array.

xs = range(10)
print(xs[-1]) # -> 9
print(xs[-10]) # -> 0

This is not exactly modular indexing. The only valid indices i for an arbitrary array xs are -len(xs) ≤ i < len(xs).

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slicing mutations