Ah, I didn't see that - it's annoying that it's still unfixed after so long

I don't know how this can be wrong - it says it's expecting exactly what I'm returning!

Falsifiable (after 2 tests and 6 shrinks):
  1.0e-2
  0.0
  0.0
expected: Single (-0.0)
 but got: Single (-0.0)

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The last line of the description

The suggestion tag should be used for giving potential improvements to the kata itself, this is just a solution

Your solution returns the number passed in, so add(1) returns 1 - if you then do add(1)(2), you're trying to call the number 1 as a function, which causes the error.

Please use the spoiler tag when posting your code - all unspoilered comments are visible from the home page, so this will show up even if someone hadn't solved the kata.

Your code fails because it checks that the password contains either a number or a special character. Special characters are not mentioned in the kata decription, only a number needs to be present.

well, it's resistant to sudden power loss I guess

This version and an equivalent full function do the exact same thing; this is just compressing it into one line. There's literally no advantage and it violates PEP-8 but some people seem to think it looks cool.

Approved

Rust translation!