logging-format-interpolation / W1202#

Message emitted:

Use %s formatting in logging functions

Description:

Used when a logging statement has a call form of "logging.<logging method>(format_string.format(format_args...))". Use another type of string formatting instead. You can use % formatting but leave interpolation to the logging function by passing the parameters as arguments. If logging-fstring-interpolation is disabled then you can use fstring formatting. If logging-not-lazy is disabled then you can use % formatting as normal.

Correct code:

import logging
import sys

logging.error('Python version: %s', sys.version)

Problematic code:

import logging
import sys

logging.error('Python version: {}'.format(sys.version))  # [logging-format-interpolation]

Additional details:

Another reasonable option is to use f-string. If you want to do that, you need to enable logging-format-interpolation and disable logging-fstring-interpolation.

Related links:

Created by the logging checker.