Py Dataclasses — Free Python Tutorial
Learn Py Dataclasses in Python with a free, beginner-friendly tutorial, examples and practice for Indian students on Syllab.in.
TL;DR: Learn Py Dataclasses in Python with a free, beginner-friendly tutorial, examples and practice for Indian students on Syllab.in.
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Py Dataclasses in Python
@dataclass is a Python 3.7+ decorator that automatically generates __init__, __repr__, and __eq__ for a class based on annotated fields. It removes boilerplate code.
Fields with default values must come after fields without defaults. Use field() from dataclasses for complex defaults like mutable objects (lists/dicts).
frozen=True creates immutable dataclasses (like tuples with names). order=True adds comparison methods (__lt__, __gt__) based on field order.
Dataclasses are ideal for data containers: configuration objects, database records, API response models — anywhere you need a simple class to hold data.
Py Dataclasses — Syntax
from dataclasses import dataclass, field
@dataclass
class Student:
name: str
marks: int
grade: str = "N/A" # default value
subjects: list = field(default_factory=list) # mutable default
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