cancel-scope-no-checkpoint (ASYNC100)#
Derived from the flake8-async linter.
What it does#
Checks for timeout context managers which do not contain a checkpoint.
For the purposes of this check, yield
is considered a checkpoint,
since checkpoints may occur in the caller to which we yield.
Why is this bad?#
Some asynchronous context managers, such as asyncio.timeout
and
trio.move_on_after
, have no effect unless they contain a checkpoint.
The use of such context managers without an await
, async with
or
async for
statement is likely a mistake.
Example#
Use instead: