python-best-practices
Python Best Practices
Type-First Development
Types define the contract before implementation. Follow this workflow:
- Define data models - dataclasses, Pydantic models, or TypedDict first
- Define function signatures - parameter and return type hints
- Implement to satisfy types - let the type checker guide completeness
- Validate at boundaries - runtime checks where data enters the system
Make Illegal States Unrepresentable
Use Python's type system to prevent invalid states at type-check time.
Dataclasses for structured data:
from dataclasses import dataclass
from datetime import datetime
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