BaseSettings - pylance complains about missing parameters

[florian-sattler]

Checks

• I added a descriptive title to this issue
• I have searched (google, github) for similar issues and couldn't find anything
• I have read and followed the docs and still think this is a bug

Bug

Output of python -c "import pydantic.utils; print(pydantic.utils.version_info())":

             pydantic version: 1.9.0
            pydantic compiled: True
                 install path: /home/user/repo/venv/lib/python3.10/site-packages/pydantic
               python version: 3.10.0 (default, Oct 11 2021, 05:33:59) [GCC 11.2.0]
                     platform: Linux-5.13.0-28-generic-x86_64-with-glibc2.34
     optional deps. installed: ['typing-extensions']

When using base settings in (even without Field see #3617 #3753)

from pydantic import BaseSettings


class MySettings(BaseSettings):
    option_1: str
    option_2: int

    
MySettings()

the resulting class expects the parameters to be provided by the program and not by the environment. Therefore Pylance seems to complain.

Btw: I use the basic setting:

"python.analysis.typeCheckingMode": "basic",
"python.languageServer": "Pylance",

The addition of parameters in BaseModel is welcome change, however I don't think the BaseSettings class should be affected as well.

[samuelcolvin]

closing as a duplicate of #3753 which has more details.