Elementary

Elementary math lol. good times.

I am not shure ho pythonic the solution is.
It is readable and performant.
Your solution includes an additional variable. That can make it more readable, but since the function does exactly one thing (calculating a grade), I dont think this adds to the readability.

The multiple return statements...hmm yes I dont like them that much but since python does not offer a clean switch case out of the box...well.

Multiple return statements are not forbidden, but I guess PEP8 somewhat discourages you to use them.
But at the same time, some examples in the style guide also contain multiple return statements.
So maybe (and I mean maybe) it is fine in this case...

I'm not sure whether or not it's pythonic, but it seems that from efficiency point of view:

• we want to return as soon as the result is ready (e.g., it allows not to use additional breaks in loops and so on)
• variables can be omitted if they are not needed later in the code (after if-else block)

From a readability standpoint I like this solution.

I thought I read that multiple return statements weren't pythonic. Is this not the case? See my solution as an example.
I think this solution is actually easier to read. Although, I can see where multiple return's might get complicated quickly.

Thoughts?

did not want to type "return" each time but now I realise, that typing "return" is a lot more convenient that typing "="-symbols...

We are not in 1960 and this is Python. There is no significant difference in speed on modern CPUs for this trivial task.

Use spoiler flag next time, please.

list comprehensions are faster than lambda expressions, great...

lol, funny method, but confusing. Never thought about getting indexes this way.