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Python iterator and generator exercises

Produce values one at a time with Python iterators and generators, on problems with tests.

Start with Endless Fibonacci

Beginner

  1. 36. Endless FibonacciA sequence that never runs out, served one number at a time35 XP6 min
  2. 217. Countdown GeneratorCount down to liftoff, one number per request30 XP4 min
  3. 254. Take the First NHelp yourself to a few items, even from a supply that never ends40 XP7 min

Intermediate

  1. 92. Interleave StreamsDeal items from several sources like cards around a table75 XP14 min
  2. 285. Pairs of NeighboursWalk a route leg by leg, and maybe back to the start65 XP12 min
  3. 299. Batches of NPack a stream of items into boxes of the same size70 XP14 min
  4. 334. Unique, in OrderSkip the repeats in a stream, even ones a set cannot hold80 XP15 min

Advanced

  1. 147. Flatten Anything, LazilyUnpack boxes inside boxes inside boxes, however deep they go135 XP30 min
  2. 356. Endless PrimesA prime number fountain that never runs dry125 XP25 min
  3. 374. Build Your Own rangeRebuild a built-in that holds a quintillion numbers in a few bytes135 XP30 min
  4. 390. Merge Sorted StreamsMany sorted feeds, one sorted timeline, read a little at a time140 XP30 min

Expert

  1. 194. A Tiny Event LoopJuggle many tasks on one thread, the way async code does260 XP60 min

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