Verify independence and uniform distribution of discrete values in Python?

[Dan Stromberg]

I've posted a question about CPython 3.[0-9]'s
random.SystemRandom().choice(list_) at
https://stackoverflow.com/questions/68319071/verify-independence-and-uniform-distribution-of-discrete-values-in-python

In short, we need to be able to support CPython's a little older than the
secrets module goes back, but we still need independence and uniform
distribution - in fact, we need cryptographic strength randomness.

Does anyone know if SystemRandom() is cryptographically strong in CPython
>= 3.0?

It appears that the good module secrets is cryptographically strong, but
doesn't go back in CPython 3.x's history far enough, and it appears to
build on random.SystemRandom().

Thanks!