Nice job!

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

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.

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

Python goes brrrrrrr codestyle <3

Nice

Yep, no need in str(value) and len(str(value)) every iteration. Unnecessary operations.

why is that?

Sadly in Python using string functions is sometimes more performant than calculating these values.

From my point of view (I'm someone who is just starting to learn Python), the most important thing when designing a function wouldn't be efficiency, the time it takes to execute, right? Whenever I manage to solve a function, I compare it with others using the timeit module, and if one runs faster than another, it's better. Many times, I find that some written in just one line are not the most efficient.

best practices

Nice one liner!

You are absolutely right! However, in codewars I view 1-line solutions more like a mini-achievement of making a code in one line, rather than the practical solution and I think there can't be good argument against writing your code in a more coherent way, naming almost every variable in an understandable way so others didn't have the hard time reading your code

As I know, at first, possible errors, non-standard situations are written in the if block.