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There’s a certain program size from which they start to make sense and further still the benefits are obvious - you have a computer to help solve puzzles for you, so why not use it if the puzzle is ‘will this peg fit into that hole?’ when you have thousands of pegs and holes.

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And so you end up writing climb_the_wooden_ladder(l: WoodenLadder) plus climb_the_aluminium_ladder(l: AluminiumLadder) or press all into an OO hierarchy instead of

climb(thing): '''Climb a thing with steps''' # prevent run time crash: if not hasattr(thing, 'getSteps'): hitDeveloper()

No, you define a Ladder (or Climbable if you’re feeling fancy today) Protocol and all remains good in the world.

No need for OO hierarchy, just use a protocol

Oh, I missed the Protocol class of the typing module. Have to further investigate the usage of this.

Thanks to you and baq!

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