bad-version-info-comparison (PYI006)

Derived from the flake8-pyi linter.

What it does

Checks for uses of comparators other than < and >= for sys.version_info checks in .pyi files. All other comparators, such as >, <=, and ==, are banned.

Why is this bad?

Comparing sys.version_info with == or <= has unexpected behavior and can lead to bugs.

For example, sys.version_info > (3, 8) will also match 3.8.10, while sys.version_info <= (3, 8) will not match 3.8.10:

>>> import sys
>>> print(sys.version_info)
sys.version_info(major=3, minor=8, micro=10, releaselevel='final', serial=0)
>>> print(sys.version_info > (3, 8))
True
>>> print(sys.version_info == (3, 8))
False
>>> print(sys.version_info <= (3, 8))
False
>>> print(sys.version_info in (3, 8))
False

Example

import sys

if sys.version_info > (3, 8):
    ...

Use instead:

import sys

if sys.version_info >= (3, 9):
    ...