As long as the given input is not a string or any characters within it are not digits, you should raise an Exception. Currently, you are only checking whether the string is a single-spaced character and any of the characters in it is NaN, which is not feasible because strings can only store characters.

I guess this is resolved.

You should use the raise keyword.

Print the input, see why your code fails that test.

hello, in prerequisites basic test i have a error "It should give an error for invalid input: True should equal False" but code is fine, all another tests passed. Work with Python, what do i do wrong?

Read the description again, 1 = 1

17935 # 1 + 7 = 3 + 5 // if the length is odd, you should ignore the middle number when adding the halves.

How 181 supposed to be true?

Added a test case for '124X212', waiting for approval (author inactive): https://www.codewars.com/kumite/62cfe4a1e73c9a002a4a5422?sel=62cfe4a1e73c9a002a4a5422

Op solved, closing.

Your code fails on one test only because tests are probably insufficient in your language...

Hint: is your last statement really ok?

5-1=4

It's [1,2,3,4] - the second value is exclusive.

This makes it exceedingly easy to calculate the length of the interval - one would have thought you'd be pleased.

Guys, I don't understand this, but how length of [1, 5] can be 4 (not 5 ??). It's just 1, 2, 3, 4, 5 right?