Personally I'd recommend WolframAlpha for quick computations or SymPy for symbolic mathematics. You could also use tools like Mathematica or Maple, but I am less familiar with those.

Really enjoying the series, thanks @JohanWiltink

Thank you, I actually agree with both your changes. Self-describing code is always a good idea (especially when there are no comments) and using next(iter(...)) or set.pop() is definitely better than creating an entire tuple just to access one item.

Yes the logic is incorrect, my bad...

I corrected it in fork.

No need to reinvent the wheel. Using libraries or modules shouldn't be frowned upon, unless it's explicitly stated you shouldn't be using them.

Just a stylistic choice.

That way all the numbers are stored in memory and don't have to be (re)computed for every function call.

Approved