Ah, I managed to miss that tab. Duplicated the trivial tests into the sample test, and wrote a random test which should disqualify extremely slow solutions.

not not id(object())//3%2

btw, I'm aware this isn't at all random, my initial version of this was an instance of malicious compliance with the tests. In fact, you can make this method perform hilariously badly:

In [1]: d = {True: 0, False: 0}

In [2]: for _ in range(1000000): d[not not id(object())//3%2] += 1

In [3]: d
Out[3]: {True: 0, False: 1000000}

In [4]: for _ in range(1000000): d[not not id(object())//3%2] += 1

In [5]: d
Out[5]: {True: 0, False: 2000000}

In [6]: for _ in range(1000000): d[not not id(object())//3%2] += 1

In [7]: d
Out[7]: {True: 1000000, False: 2000000}