Python Dataclass Guide

A guide to defining clean, boilerplate-free data structures using Python's dataclass decorator.

Usage

Ask about dataclass features, configuration, patterns, or comparison with alternatives.

Examples

• "Create a dataclass with default values and validation"
• "How do I make an immutable dataclass?"
• "When should I use dataclass vs Pydantic vs NamedTuple?"

Guidelines

• Use field(default_factory=) for mutable default values
• Use frozen=True for immutable value objects
• Use __post_init__ for validation and computed fields
• Use slots=True in Python 3.10+ for memory efficiency
• Use kw_only=True to prevent positional argument mistakes