Python Data

Load python3-core for standing defaults. Load python3-typing for boundary schemas. Load python3-testing for parser and edge-case tests.

Quality Checklist

• Schema validated at first stable ingress point — not deep in transforms
• dtype= explicit in pd.read_csv() / pd.read_excel() — never rely on inference
• No raw pd.DataFrame crossing module boundaries without documented column contract
• Merge/join results checked for unexpected nulls and row count changes
• model_config = {"strict": True} on all Pydantic boundary models
• No inplace=True — deprecated, returns None, causes silent bugs
• Notebook logic that survived 3+ uses extracted into tested modules

Gotchas