Ignore specific error codes from configuration file

[amikrop]

Please make it possible to ignore errors with arbitrary error codes, though the configuration file.
Essentially, make the # type: ignore[code, ...] behavior possible through the configuration file, as it would be
nice to have the ability to keep the code visually simpler, by moving these directives from comments, to the
config file.

[gvanrossum]

You can do it from the command line, e.g. --disable-error-code attr-defined.

IIUC you can do it from the config file too (disable-error-code = attr-defined) -- it just needs documenting.

[hauntsaninja]

(Note this feature hasn't made it to a mypy release yet, so you'll need to install mypy from git master to do this)

[amikrop]

Alright, thanks for your answers.

[gvanrossum]

Keeping this open because it needs docs.

[gvanrossum]

Whoops, trying this with master, it looks like there's a bug in the code that reads this flag from mypy.ini.

usage: mypy [-h] [-v] [-V] [more options; see below]
            [-m MODULE] [-p PACKAGE] [-c PROGRAM_TEXT] [files ...]
mypy: error: Invalid error code(s): i, m, o, p, r, t

The line in mypy.ini was

disable_error_code = import

[amikrop]

Installed a git checked out version of mypy to try this. The command-line way worked (for one or more error codes), but the config file way did not:
mypy: error: Invalid error code(s): i, m, o, p, r, t
Other list-receiving options, as always_true did not have this problem.
Printing options.disable_error_code in main.py:process_options gave this:
['i', 'm', 'p', 'o', 'r', 't']
which is strange, because the --disable-error-code argument is added to the parser exactly the same way others (like --always-true) do.
I think the mypy.ini file is not malformed:
[mypy]
always_true = foo, bar
disable_error_code = import

Python 3.8.5

Just saw you found out already by yourself :)

Trying to debug this myself, but in case somebody else does before me, I would be interested to know the cause of this.

[gvanrossum]

Probably something's needed to flag that config option as a list. I'd be grateful if you debugged this and came up with a fix!

[amikrop]

Working on it.
Edit: done
#9537

[Nikhil1O1]

@gvanrossum can I work on the documenting this thing??

[gvanrossum]

@Nikhil1O1

@gvanrossum can I work on the documenting this thing??

Please do!

[hauntsaninja]

I think we actually have documentation for this; both CLI and config are now documented. (But documentation can almost always be improved, so if you see improvements to be made, feel free to suggest them!)