False positive on `extra` kwargs

[kornicameister]

Consider following piece of code:

logger.info(
    'Booting up worker',
    extra={'queue': queue_name},
)

It is obviously flagged as:

[mypy] Not all arguments converted during string formatting  [str-format] [E] 

[kornicameister]

@Delgan @ThibaultLemaire I'd like to gather your opinion on that please ;-)
Would it be consider a good call or a false positive ?

[ThibaultLemaire]

It doesn't do what it seems, so I'd say it's good that it raises an error. The extra dict is intended to be passed by **kwargs, so this won't work with a sink configured to use extra[queue]. (Although the error doesn't exactly tell you all that)

The real problem though is that it will tell you the same for

logger.info(
    'Booting up worker',
    queue=queue_name,
)

But I think I've already touched on that somewhere that I can't find again at this time.

[Delgan]

Technically it's correct code. Basically, I would never consider this a error within Loguru.
However, it may be interesting to warn Mypy users about possible misuse. Most of the time, it's indeed a mistake. Especially for people migrating from standard logging. As long as it's possible to disable the warning for the theoretically valid use case, it seems to be a good catch in general.