Track 11 · Lesson 11 of 12

Dataclasses

Write record-style classes in a few lines with @dataclass, including defaults, default factories, frozen and ordered instances and __post_init__ validation.

You will be able to

• Define a dataclass with typed fields and get __init__, __repr__ and __eq__ generated
• Give fields default values, using field(default_factory=list) for mutable ones
• Make instances immutable with frozen=True and sortable with order=True
• Validate and normalise fields in __post_init__
• Exclude fields from comparison or repr with field(compare=False, repr=False)