Yes, you are right. The Task says "Given a positive number, find ...", I've overlooked this. Thank you

Nope, 0 is not a positive number, so it is out of the scope of this kata

fixed

This is not the case. For example, x=2.
The action lambda x:0 results in 0,
and the action lambda x:x%2 results in 0 too

There is a trouble with python random test case -
a test should look as a tuple:

(command, number_to_operate_with, expected_result_of_operation, "explanation");

the command is in range 0..4. But in the test case we see random.randint(0,1000000)

It should be:
random.randint(0,1000000) % 5
or:
random.randint(0,4)

Nobody's going to change the requirements now. Apart from that, such inputs would contradict the idea of the kata.

Fixed no.1

Thank you ))

Added to description.

it means "don't hard code everything" (I guess...)