Reimplement `itertools` for fun & profit
summary
Reimplements the module itertools by coding 19 iterators in pure Python reimplementation, with automated tests pulled from the GitHub repo to validate behavior. Demonstrates that range is lazy — range(1) and range(99999999999999999) take the same time and constant memory — and shows how next and iter make for loops work. Exercises run in a loop with test feedback, and a working 7–8 line while loop replaces for in the demos.
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chapters (5)
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