Have a way to force environment variable names to upper case regardless about pydantic-settings HOT 2 CLOSED

We've moved BaseSettings into the pydantic_settings package for use with pydantic v2. I'm going to transfer this issue to that repository, but I'll note that given some of the improvements that have been made as part of the move, I suspect that it will be more straightforward to achieve this change in behavior just. @hramezani will probably know best.

from pydantic-settings.

You can use case_sensitive config and set all your environment variables upper-case. Then you have to define your settigns fields upper-case as well. Here is an example in pydantic-settings:

from pydantic import ConfigDict

from pydantic_settings import BaseSettings


class Settings(BaseSettings):
    FOO: str

    model_config = ConfigDict(case_sensitive=True)

import os
os.environ['FOO'] = 'test1'
os.environ['foo'] = 'test'

print(Settings())
# FOO='test1'

If you don't want to use upper-case field names, you can use Field.validation_alias:

from pydantic import ConfigDict, Field

from pydantic_settings import BaseSettings


class Settings(BaseSettings):
    foo: str = Field(validation_alias='FOO')

    model_config = ConfigDict(case_sensitive=True)

import os
os.environ['FOO'] = 'test1'
os.environ['foo'] = 'test'

print(Settings())
# foo='test1'

Note: pydantic-settings is in alpha state. You can install it by pip install pydantic-settings --pre

from pydantic-settings.