I feel like the question you've suggested people ask themselves is a bit over-complicated. Maybe the right way to phrase the question is instead just:

Can somebody else guess these numbers?

It doesn't actually matter whether bad guys can guess your numbers because you use Python's non-cryptographic PRNG or because you mistakenly overwrote the genuinely random numbers you had with zeroes, or they've planted a physical device inside your computer stealing the random numbers used, it only matters that they can guess the numbers.