Hand-Rolled vs dataclass Equality

Medium ⏱ 12 min 49% acceptance ★★★★☆ 4.2
Write the same tiny record twice: ManualTag(name) with hand-written __eq__ (comparing name, NotImplemented for foreign types), and AutoTag(name) as a plain @dataclass. Then compare() returns the tuple (ManualTag('x') == ManualTag('x'), AutoTag('x') == AutoTag('x')) — both True, showing what the decorator generates for you.

Examples

Example 1
Input
compare()
Output
(True, True)
Explanation

The dataclass wrote the same __eq__ you wrote manually.

Constraints

  • ManualTag must not use @dataclass.
  • AutoTag must not define __eq__ itself.

Topics

OOPdataclass comparison

Companies

JetBrainsGitLabPostman

Hints

Hint 1

Dataclasses generate __eq__ from the field list.

Hint 2

Return NotImplemented, not False, for foreign types in the manual version.

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