Nice one, see the "Solution" link for correct answer.

Yes I understand your point, but I'm trying to reach out so people are aware and can use it in Python education. I feel it can really help beginners understand tricky concepts with ease, bit it's hard to reach a bigger audience these days. Sorry for the repetition, I'll guess I should cut back a bit.

Different languages make different choices. The disadvantage of Haskell is that if you want to change one value in a collection of a million values that it either makes a full copy or tries to optimize by sharing values behind the scene, both resulting in significant overhead. Most people already understand that pure functional programming languages don't deliver except in very specific circumstances: Haskell TIOBE rating 0.32%, https://www.tiobe.com/tiobe-index/

Incorrect sorry, check the "Solution" link for the correct answer.

Thanks. I didn't know: https://memory-graph.com/#code=x+%3D+%280%2C+%5B1%2C+2%5D%29%0Atry%3A%0A++++x%5B1%5D+%2B%3D+%5B3%5D++%23+calls+list.__iadd__%2C+then+reassigns+x%5B1%5D%0Aexcept+TypeError+as+e%3A%0A++++print%28e%29%0A%0Ax+%2B%3D+%284%2C%29++%23+calls+tuple.__add__%2C+then+reassigns+x%0A%0Aprint%28x%29%0A%0A%0Aclass+MyClass%3A%0A++++%0A++++def+__add__%28self%2C+other%29%3A%0A++++++++print%28%27__add__%27%29%0A++++++++%0A++++%23def+__iadd__%28self%2C+other%29%3A%0A++++%23++++print%28%27__iadd__%27%29%0A%0Aa+%3D+MyClass%28%29%0Ab+%3D+MyClass%28%29%0Aa+%2B%3D+b++%23+calls+__add__+if+__iadd_+doesn%27t+exist%0A&play=

__add__ is called with + and __iadd__ is called with +=, and there is a difference: https://www.reddit.com/r/PythonLearning/comments/1nw08wu/right_mental_model_for_python_data/

Yes a you get for free to set the tone, the others are more interesting.

Nice one.

The whole point is to practice Python Data Model concepts, it's not a best-way-to-code example, so feel free to hate.

You are right, in landscape mode it's better, but still not ideal. It's a project I don't have time for now. On the other hand, did you run Python code, in an IDE where the debugger visualizes the whole program state, on your Phone before?

C is incorrect,sorry. See the "Solution" link for the correct answer.

Actually running the code? I got to the stage where only AI can help me understand anything ;-)