Python/Classes & structure 8 min
Dataclasses and type hints
Records without the boilerplate.
dataclasstype hints
@dataclass writes __init__, __repr__ and __eq__ for you from annotated fields — ideal for the record-shaped objects that fill data code.
python · editable
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Try it: Add a units field defaulting to 1 and use it in a revenue property.
Mutable defaults need field(default_factory=list) — sharing one list across every instance is a notorious bug.
Type hints do not change runtime behaviour, but they document intent and let editors and type checkers catch mistakes early.
python · editable
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