Exactly, that was my point. This kumite needs new test inputs

Correct, this will return False if it is odd and True if it is even. I've seen some more complex mathematical methods to detect if it's a power of two with just simple arithmetic but what would probably be easiest is to import Math and do return False if math.log(n, 2)%1 else True

I think this checks if a number is odd, not if it's a power of two. For example, 12 % 2 is equal to 0, yielding True but 12 is not a power of two.

thank you ,this is good way

Yeah, you're right. At some point this kumite changed into testing whether or not the number is even.

As for the power_of_two, I think that the first solution was the best one:
return n & ( n - 1 ) == 0

Am i mistaken or does this only check if the number is even and not odd, but does not check if it's a power of two? For example

power_of_two(6)
True

I guess the test cases only test odd numbers for the False test case and thus the test cases work fine.

Absurd solution, congratulations

Wow, cool!