mypy complains whn instantiating a settings object

[vladdu]

Hi! I couldn't find any other mention of this, so probably I'm doing something wrong.

I have a settings class inheriting from BaseSettings, and when instantiating it with a no-parameter constructor, mypy complains that arguments are missing. Is this something that the pydantic.mypy plugin handles? Unfortunately, I can't use that, because for some reason it makes mypy crash. Is there another workaround than providing dummy default values for everything?

[hramezani]

Hi @vladdu,

Thanks for reporting this issue 🙏

Yes, The only possible way to fix mypy error is using pydantic mypy plugin

[dmontagu]

@vladdu if you can share some more details about your crash we can look into it and try to resolve it

[tshipenchko]

I confirm that using pydantic mypy plugin fixes the issue

$ mypy app/cli/__main__.py  # without plugin
app/cli/__main__.py:18: error: Missing named argument "bot_token" for "Config"  [call-arg]
Found 1 error in 1 file (checked 1 source file)
$ mypy app/cli/__main__.py  # with plugin
Success: no issues found in 1 source file

My pyproject.toml:

[tool.mypy]
plugins = ["pydantic.mypy"]