Python doesn't have arrays and the code above isn't creating a list either. It's creating a generator and the creation specifically takes almost no resource, since the values are generated lazily.

AFAIK the difference comes from the code above calling isdigit function a lot of times, whereas replace is only called 10 times. Keep in mind, that both of the functions are highly optimized and written in C, so that's why the the code with more function calls and more python is slower. That also for example causes some O(n^2) algorithms to run faster in python, than an O(n log n) alternative.

Sorted is O(n log n) complexity, both sorted and sort use the same algorithm behind the scenes. Creating a list is O(1).

i did same thing but i just said arr != None its acccepted too here >1

really nice

yeah I used .isnumeric lol

Bc creatin new array is more time and resource consuming. Using regex is BP for this case. My advise for everyone: learn what is regix (import re) and how to use it

When we do 'max' and 'min' - there is some kind of sorting happening under the hood for two times.

This is wrong. When we do min and max, there is no sorting happening under the hood, for a total of zero times.

Why is it so? I solved with 'min' and 'max' too, but now I think that 'sort' could be more efficient.
When we do 'max' and 'min' - there is some kind of sorting happening under the hood for two times.
But using 'sort' - sorting happens just once.

According to tests from 'pprunesquallor' - 'sort' is more efficient. As you said - only for short lists.
What lists are long? What is the len value after which 'sort' becomes less efficient?
And why?

But didn't it takes more time for slicing, if there is long list? And what if we check "len(arr) > 2" instead of "len(arr) > 1". Wouldn't it be faster?

An empty list is false(y), so it tests if the list (arr) is empty or not

Why 'arr' is used as condition?

drodger, Thx.

PavlovNikita,
This is only a 'clever' way to solve it and not either the only way to solve it or the most readable way to solve it. I personally prefer longer code when it is more easily readable. However, sometimes, it is efficient to do it in a single-line/shorter-code.

After joining codewars, I have tried to be terse with code to learn terseness. So, now, I try to balance both as ultimately code needs to be read and re-read and maintained.

Thx