Description

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Advanced · 12 min

Data classes

Define readable data-focused classes with generated methods.

Declare fields

@dataclass generates an initializer and a useful representation from the annotated fields.

from dataclasses import dataclass

@dataclass
class Product:
    name: str
    price: int

item = Product("Book", 12)
print(item.price)

Output

12

Use defaults safely

A field can have a default value. Required fields still come before fields with defaults.

from dataclasses import dataclass

@dataclass
class Task:
    title: str
    done: bool = False

print(Task("Test").done)

Output

False

Data classes

  1. Read both data classes examples before answering.
  2. Run the task, compare its exact output, and revise the code if needed.

Try it yourself

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Create a booking record

Define Booking as a data class with guest: str, nights: int, and confirmed: bool defaulting to False. Display the supplied booking.

Practice