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title: "#pydantic Code Snippets"
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# #Pydantic

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# #Pydantic

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[![Python Dataclass Patterns: Slots, Frozen Instances, and Field Validation](/_astro/hero.CiNSoA2B_5XUnO.webp)](/codesnippets/post/python-dataclass-slots-frozen-field-validation)

## [Python Dataclass Patterns: Slots, Frozen Instances, and Field Validation](/codesnippets/post/python-dataclass-slots-frozen-field-validation)

-   [Python](/codesnippets/categories/python)
-   [Backend](/codesnippets/categories/backend)
-   31 Aug 2026
-   03 Mins read

Quick Tip Reach for @dataclass(slots=True, frozen=True) with a post\_init check and you get a small, immutable, validated value object in about five lines. The Problem The problem

[#Python](/codesnippets/tags/python)[#Dataclass](/codesnippets/tags/dataclass)[#Slots](/codesnippets/tags/slots)+3 tags

[Python](/codesnippets/python)

[View Code](/codesnippets/post/python-dataclass-slots-frozen-field-validation)