I found there was some leftover py2k code in a project that UP rules would not catch because it just matches sys.version_info as a tuple. If you just check for the 1st element, which is kinda common in the old days, it will not show an error.

import sys

if sys.version_info[0] < 3:
    print('old')

if sys.version_info < (3, 0):
    print('also old')

UP036

$ ruff check --isolated --select UP036 foo.py
foo.py:6:4: UP036 Version block is outdated for minimum Python version
  |
4 |     print('old')
5 |
6 | if sys.version_info < (3, 0):
  |    ^^^^^^^^^^^^^^^^^^^^^^^^^ UP036
7 |     print('also old')
  |
  = help: Remove outdated version block

Found 1 error.
No fixes available (1 hidden fix can be enabled with the `--unsafe-fixes` option).

It would be helpful if both options were found. I believe this is only relevant for python 2 since python 4 is no longer going to exist, but python 3 will be the forever version with the 2nd number being the de facto python version.

If so, this rule could also catch these cases.

if sys.version_info[1] < 12: ...

In time: Ruff 0.6.1