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flake8-2020

library1.8.1pypypiunverified

A flake8 plugin that checks for misuse of `sys.version` or `sys.version_info` to detect code that will break on Python 4. Current version: 1.8.1 (requires Python >=3.8). Released irregularly; last release Dec 2024.

testing

pip install flake8-2020

github ↗package ↗

INSTALL

IMPORT

SIG · FLAKE8-2020

flake8-2020

testingpythonv1.8.1

Install

1.8s avg

Import

—

Disk

17MB

Pass rate

10/ 10

Env Coverage10 / 10

glibc

3.9–3.13

musl

3.9–3.13

Install & Compatibility

Where this runs

tested against v1.8.1 · pip install

no network on importno background threads

Install × environment matrix

Each cell = how many times install + import succeeded across repeated harness runs. Partial = flaky.
glibc = Debian/Ubuntu slim · musl = Alpine Linux

musl

py 3.10–3.95 runs

installs and imports cleanly · install 0.0s · import 0.000s · 19.3MB

glibc

py 3.10–3.95 runs

installs and imports cleanly · install 1.8s · import 0.000s · 20MB

17MB installed

● package 17MB

Code

Verified usage

Verified import paths — ran on the pinned version, not inferred.

flake8-2020

✓ Installed as a plugin; no explicit import needed

flae8 automatically discovers plugins; do not import flake8_2020 in your code.

The plugin is automatically discovered by flake8. Run 'flake8 yourfile.py' to check for sys.version misuse.

# Run flake8 with the plugin enabled (flake8 discovers it automatically) # The plugin checks for Python 4 compatibility issues import sys print(sys.version_info[0]) # This will trigger YTT103 (sys.version_info used as tuple) print(sys.version_info.major) # Correct usage

Debug

Known issues

gotchaThe plugin is automatically enabled when installed; no configuration needed. However, it only works if flake8 is run on the file.

fix

Run flake8 from the command line or integrate into your pre-commit hooks.

affects: all

deprecatedThe deprecated YTT301 (sys.version[0:3] used) and YTT302 (sys.version[2] used) are still emitted but may be removed in future versions.

fix

Use sys.version_info.major instead of string slicing.

affects: 1.7.0+

breakingIn version 1.8.0, the minimum Python version was raised to 3.8, dropping Python 3.6 and 3.7 support.

fix

Upgrade to Python 3.8 or later.

affects: 1.8.0+

Upgrade

Version history

1.8.1latest on PyPI · released Jun 10, 2023

Audit

Dependencies

No dependency data recorded yet.

Agent activity

8 hits · last 30 days

node

Resources

githubhttps://github.com/asottile/flake8-2020 ↗

packagehttps://pypi.org/project/flake8-2020/ ↗