Asyncio lint errors -- ruff check --select=ASYNC

[cclauss]

• https://docs.astral.sh/ruff
• https://docs.astral.sh/ruff/rules/#flake8-async-async

Describe the bug
% ruff check --select=ASYNC --statistics

54	ASYNC230	blocking-open-call-in-async-function
 6	ASYNC221	run-process-in-async-function

Expected behavior
What was supposed to happen?
% ruff check --select=ASYNC --statistics

No errors.

% ruff rule ASYNC230

blocking-open-call-in-async-function (ASYNC230)

Derived from the flake8-async linter.

What it does

Checks that async functions do not open files with blocking methods like open.

Why is this bad?

Blocking an async function via a blocking call will block the entire
event loop, preventing it from executing other tasks while waiting for the
call to complete, negating the benefits of asynchronous programming.

Instead of making a blocking call, use an equivalent asynchronous library
or function.

Example

async def foo():
    with open("bar.txt") as f:
        contents = f.read()

Use instead:

import anyio


async def foo():
    async with await anyio.open_file("bar.txt") as f:
        contents = await f.read()

---

% ruff rule ASYNC221

run-process-in-async-function (ASYNC221)

Derived from the flake8-async linter.

What it does

Checks that async functions do not run processes with blocking methods.

Why is this bad?

Blocking an async function via a blocking call will block the entire
event loop, preventing it from executing other tasks while waiting for the
call to complete, negating the benefits of asynchronous programming.

Instead of making a blocking call, use an equivalent asynchronous library
or function.

Example

async def foo():
    subprocess.run(cmd)

Use instead:

async def foo():
    asyncio.create_subprocess_shell(cmd)