runtimecompare approaches one problem · two ways
Compare Approaches
The same problem solved different ways in Python, run on the same input, with what really differs and when to use each.
Hand-written class vs @dataclass
A product record that prints nicely and compares by value.
what differs
@dataclass writes __init__, __repr__ and __eq__ from the annotated fields. Options add ordering (order=True), immutability (frozen=True) and smaller instances (slots=True).
at a glance
| approach | use it when |
|---|---|
| A · plain class | The class has real behaviour and custom construction. |
| B · @dataclass | Records: data first, behaviour second. |
Watch out: Type hints aren't checked at runtime: Product(1, 2, "free") works. Validate in __post_init__ if you need to.
the outputs
Each approach runs on the same input.
concepts
dataclasses__repr____eq__
learn it
Dataclasses: records without the boilerplate
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