log-exception-outside-except-handler (LOG004)

Derived from the flake8-logging linter.

Fix is sometimes available.

This rule is unstable and in preview. The --preview flag is required for use.

What it does

Checks for .exception() logging calls outside of exception handlers.

This function should only be called from an exception handler.

Calling .exception() outside of an exception handler attaches None as exception information, leading to confusing messages:

>>> logging.exception("example")
ERROR:root:example
NoneType: None

import logging

logging.exception("Foobar")

Use instead:

import logging

logging.error("Foobar")

The fix, if available, will always be marked as unsafe, as it changes runtime behavior.