Feature request: Add `pydantic-settings` to v3 Layer

[tkasuz]

Use case

To facilitate migration from v2 to v3, it would be advantageous to include pydantic-settings as an optional dependency in the v3 layer. This is because v3 relies on Pydantic v2, necessitating the import of BaseSettings from pydantic-settings, which is currently absent from the v3 layer.

Solution/User Experience

Since this is not directly related to parser library, it would be better to included in the all option like the following:

[tool.poetry.extras]
parser = ["pydantic"]
validation = ["fastjsonschema"]
tracer = ["aws-xray-sdk"]
redis = ["redis"]
all = [
  "pydantic",
  "pydantic-settings",
  "aws-xray-sdk",
  "fastjsonschema",
  "aws-encryption-sdk",
  "jsonpath-ng"
]

Alternative solutions

No response

Acknowledgment

• This feature request meets Powertools for AWS Lambda (Python) Tenets
• Should this be considered in other Powertools for AWS Lambda languages? i.e. Java, TypeScript, and .NET

[boring-cyborg]

Thanks for opening your first issue here! We'll come back to you as soon as we can.
In the meantime, check out the #python channel on our Powertools for AWS Lambda Discord: Invite link

[leandrodamascena]

Hi @tkasuz! Thanks for raising this issue! I agree with you that this might make the migration from Powertools v2 to v3 easier for those who are building Lambda exclusively with Powertools layers and not installing anything with pip. Even Pydantic v2 changed the way BaseSettings is imported and force you change your code, I think it might make life easier for those who are migrating. I don't think this is a big issue from a performance/size perspective, because both pydantic_settings and dotenv (transitive dependency) are less than 500kb.

(venv) ➜ du -sh venv/lib/python3.12/site-packages/*dotenv* 
116K	venv/lib/python3.12/site-packages/dotenv
 48K	venv/lib/python3.12/site-packages/python_dotenv-1.0.1.dist-info
(venv) ➜ du -sh venv/lib/python3.12/site-packages/pydantic_settings*
276K	venv/lib/python3.12/site-packages/pydantic_settings
 20K	venv/lib/python3.12/site-packages/pydantic_settings-2.6.1.dist-info
(venv) ➜  

Can you please send a PR to add this support?

[github-actions]

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