In #4932, there was a bug because if-else blocks were rewritten as ternary operations which SIM401 wouldn't be able to fix. The bug was fixed but there's still the fact that you can have code like

obj: dict = ...
key = ...

value = obj[key] if key in obj else "Not found"

which will not be corrected with ruff check --fix --select SIM .

Expected behavior:

obj: dict = ...
key = ...

value = obj.get(key, "Not found")

Checked with ruff v0.0.287