I did it this way and was so proud of myself for figuring out the list comprehension XD

This is like what I did, but in one line.

Thank you for this! This is what I wanted to do but didn't know how to do, so had to longhand it. This is very neat, thanks for teaching me

OMG, thank you so much for this. I kept seeing this syntax in katas and had no idea what was going on. Appreciate it so much!

did the same hehe

You modified the name of the given parameter, which I wouldn't consider 1) useful and 2) good practice, especially since str shares its name with a function.

The complexity in worth case (not any of b_values are in a_array) could be more efficient, but it's an elegant way of writing a solution

Python noob here, I gotta say Python one-liners like list comprehension are starting to look pretty understandable (at this level of complexity, at least...)
But cramming logic that repeats on each 'x' doesn't look good for Big O, for sure.

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It's beautiful... I'm always in a hurry and don't think much.

But seriously, what scares me is the number of cheerful comments.
We are in deep trouble.

Python goes brrrrrrr codestyle <3

then the if function won't be necessary anyways. solution still works.