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bad-version-info-comparison (PYI006)

Added in v0.0.254 · Related issues · View source

Derived from the flake8-pyi linter.

What it does

Checks for uses of comparators other than < and >= for sys.version_info checks. 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, 1) will resolve to True if your Python version is 3.8.1; meanwhile, sys.version_info <= (3, 8) will not resolve to True if your Python version is 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): ...