PyLint message: logging-format-interpolation

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It is not true for logger statement because it relies on former “%” format like string to provide lazy interpolation of this string using extra arguments given to the logger call. For instance instead of doing:

logger.error('oops caused by %s' % exc)

you should do

logger.error('oops caused by %s', exc)

so the string will only be interpolated if the message is actually emitted.

You can’t benefit of this functionality when using .format().

Per the Optimization section of the logging docs:

Formatting of message arguments is deferred until it cannot be avoided. However, computing the arguments passed to the logging method can also be expensive, and you may want to avoid doing it if the logger will just throw away your event.

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