Description issue:

The task is to return the maximum sum of the elements located between two negative elements.

is improper, should be comparable to:

The task is to return the maximum of the sums of the elements located between two negative elements.

testing for: ['abc5-35-1928egg.txt']

['abc5-35-1928egg.txt'] should equal ['abc35-5-1928egg.txt']

Nothing was fixed.

C Translation kumited.

Ambigiuous/unclear spec:

• "... divided by the arithmetic mean of this list" -> is that the original list or the list we obtain between the first and second negative values?
• "The task is to return the sum of the numbers between the first and second negative elements ..." -> I would specify that the bounds are excluded
• provide an explanation in the description of both sample tests to avoid confusion.

Floats should be compared with test.assert_approx_equals

https://github.com/Codewars/codewars.com/wiki/Codewars-Python-Test-Framework-V2#approximate-equality-test

Tests expect wrong results.

For example:

arr = [5, -1, 1, -2]

1.3333333333333333 should equal 1.33

The correct result is 1.3333333333333333 (4/3).

P.S. Don't try to request rounded results.
https://docs.codewars.com/authoring/kata/floating-point/
https://www.codewars.com/kata/5f9f43328a6bff002fa29eb8

9.333333333333334 should equal 9.33 Unless this is my error, you need to either tell us to round to two decimal places OR (and preferably) use better test frameworks for floats.

You also do not tell us what to do in the case of division by zero. Do we raise an exception? Do we use the next highest number?

"Convert math formula into a program" is neither novel nor interesting kata idea.

Why ALL kata with floats ask for rounded results?

Don't round float results!

https://docs.codewars.com/authoring/kata/floating-point/
https://www.codewars.com/kata/5f9f43328a6bff002fa29eb8
https://github.com/Codewars/codewars.com/wiki/Codewars-Python-Test-Framework-V2#approximate-equality-test