Some years ago, @Zac-HD wanted to lint for async antipatterns, and together with @cooperlees built out some initial checks in flake8-async. However, it quickly became clear that many checks would need to specific to Trio (or anyio, or rarely asyncio), and so Zac went on to create flake8-trio.

Fast-forward to early 2024, and flake8-trio also supports anyio, which makes the name and error code pretty confusing. Since it's become a strict superset of this plugin, we decided to merge them under the flake8-async name and add asyncio support here too - which should simplify both direct use, and downstream use via ruff.

• ASYNC100: Warning about the use of a blocking http call inside an async def
• ASYNC101: Warning about the use of open, time.sleep or methods in subprocess, inside an async def.
• ASYNC102: Warning about the use of unsafe methods in os inside an async def.

When you wish to add a check to flake8-async please ensure the following:

• This README.md gets a one line about your new warning
• CHANGELOG gets added to a ## UNRELEASED section
• Unittests are added showing the check hilight where it should and shouldn't

To run our test suite please use tox.

python3 -m venv --upgrade-deps /tmp/tfa
/tmp/tfa/bin/pip install tox
# Linting
/tmp/tfa/bin/tox -e check
# Test Running
/tmp/tfa/bin/tox -e test -- -n auto

MIT