RFE: possibility to change category of a message in config

[scop]

Is your feature request related to a problem? Please describe

As discussed in #3250, an option to change the category of a message would be useful.

My first use case would be to exit with a nonzero status if some (currently) informational messages are emitted, e.g. useless-suppression and use-symbolic-message-instead.

A secondary use case I can think of would be to lower the severity of a warning or an error message to informational. The difference of this compared to disabling messages is that the messages would be displayed in the output, but not cause a nonzero exit.

Describe the solution you'd like

Configurabie categories/severity levels for messages, including their effect on the exit status.

Additional context

I gather the categories are currently kind of hardwired to the messages identifiers, so maybe it would be good to not change them but just their "effect" so there's no confusion about what is being referred to in online discussions etc.

[daoiqi]

Yes, In something I want to change message level to warning. so I can get precise evaluation score

b = 1,

R1707: Disallow trailing comma tuple (trailing-comma-tuple)

[Pierre-Sassoulas]

I'm going to close as won't fix because the change would be humongous and would yield strange results like the msgid not matching the actual reported category. Also it's possible to deal with this with a combination of disable / enable and it's now possible to exit with an error code for informational messages.

[scop]

and it's now possible to exit with an error code for informational messages.

Interesting, I have missed this. I assume you mean fail-on=I?

[Pierre-Sassoulas]

I assume you mean fail-on=I?

Yes, exactly. Available for pylint above 2.9.0