Python Dataclass #

This is kind of continuation of python decorators in brief. As we have seen, decorators are a really easy way to extend our functions and methods(and classes). dataclassis such a very useful decorator from built-in dataclasses module in python(3.7+).

Why Dataclass #

What is so great about dataclass anyway, you ask? A lot actually. You ever sit down trying to write a class and it a lot of work to write special methods, and especially hard to maintain them. This decorator helps massively in such cases. This decorator generate such methods automatically.
Now lets start with code:

Using Dataclass #

Below here is a simple code snippet

# to import dataclass decorator
from dataclasses import dataclass

# to use dataclass decorator onto our class
@dataclass
class item:
    item_name: str
    item_price: float
    item_quantity: int = 1

    def total_cost(self):
        pass

will generate, __init__() special method by itself equivalent to

def __init__(self, name: str, item_price: float, item_quantity: int = 0):
    self.name = name
    self.item_price = item_price
    self.item_quantity = item_quantity

By default dataclass decorators has these parameters

@dataclass(init=True, repr=True, eq=True, order=False, unsafe_hash=False, frozen=False)
class class_name:

to study dataclass in depth refer to offical documentation.