artikae

    class Thing:
        def __init__(self, a, b):
            self.a = a; self.b = b
        def __eq__(me, them):
            return me.a == them.a and me.b == them.b
    >>>[1, 2, Thing(6, "Hi")] == [1, 2, Thing(6, "Hi")]
    True
    >>>[1, 2, Thing(6, "Hi")] == [1, 2, Thing(6, "Hello")]
    False

  import Control.Lens
  baseLens --> nextIndex = baseLens . ix nextIndex
  assocIn structure keyLens newValue = set keyLens newValue structure

  setTo256 structure = assocIn structure (ix 0 --> 0 --> 0) 256
  -- setTo256 [[[1]], [[2]]] returns [[[256]], [[2]]]