Python's magic methods

Who wouldn't want to sprinkle a little magic onto their code? Well, with Python's magic methods, you can! You can even get some neat functionality out of it too.

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I get a lot of people asking, so here's my Visual Studio Code setup!

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#python #coding #howto

[zbigniewloboda]

The front of the editor is to small for handheld devices.

[cn-ml]

00:00 Intro
01:30 init
02:36 init_subclass
04:38 str
05:24 repr
06:29 int, float
06:49 hash
07:38 operators (add, ...)
11:00 i-operators (iadd, ...)
12:15 equality operators (eq, ne)
13:40 comparison operators (le, lt, ge, gt)
15:09 contains (in operator)
16:24 getitem, getattr (index operator)

[JorgeEscobarMX]

The font is way to small for my phone.

[Alan]

There's an ORM package called SQLModel created by the author of FastAPI, which is built on top of SQL Alchemy and Pydantic, utilized the __init_subclass__ dunder method to distinguish the defined class should be a database table or just or a normal Pydantic model.

[doritorick]

Hey, great video showcasing those methods! I was wondering, how did you manage to get that beautiful, clean terminal? Mine shows unnecessary paths and details and a bunch of other ugly stuff before actually displaying the output of my program. Perhaps you could make a tutorial on how to clean up the terminal?

[airatvaliullin]

13:19
I think it'd be better to raise a TypeError when trying to compare the object with an object of a different type:
from typing import Self
def __eq__(self, other: Self) -> bool:
if not isinstance(other, self.__class__): raise TypeError(f'The equality operator is not defined between {self.__class__} and {other.__class__} ')
return ... # normal logic between two instances of Self
This wouldn't let such comparisons (which are almost surely errors) run quietly.