Python

6287 readers

79 users here now

Welcome to the Python community on the programming.dev Lemmy instance!

📅 Events

Past

November 2023

PyCon Ireland 2023, 11-12th
PyData Tel Aviv 2023 14th

October 2023

PyConES Canarias 2023, 6-8th
DjangoCon US 2023, 16-20th (!django 💬)

July 2023

PyDelhi Meetup, 2nd
PyCon Israel, 4-5th
DFW Pythoneers, 6th
Django Girls Abraka, 6-7th
SciPy 2023 10-16th, Austin
IndyPy, 11th
Leipzig Python User Group, 11th
Austin Python, 12th
EuroPython 2023, 17-23rd
Austin Python: Evening of Coding, 18th
PyHEP.dev 2023 - "Python in HEP" Developer's Workshop, 25th

August 2023

PyLadies Dublin, 15th
EuroSciPy 2023, 14-18th

September 2023

PyData Amsterdam, 14-16th
PyCon UK, 22nd - 25th

🐍 Python project:

💓 Python Community:

#python IRC for general questions
#python-dev IRC for CPython developers
PySlackers Slack channel
Python Discord server
Python Weekly newsletters
Mailing lists
Forum

✨ Python Ecosystem:

🌌 Fediverse

Communities

#python on Mastodon
c/django on programming.dev
c/pythorhead on lemmy.dbzer0.com

Projects

Pythörhead: a Python library for interacting with Lemmy
Plemmy: a Python package for accessing the Lemmy API
pylemmy pylemmy enables simple access to Lemmy's API with Python
mastodon.py, a Python wrapper for the Mastodon API

Feeds

founded 1 year ago

MODERATORS

jnovinger

erlingur

norambna

[Meme] Swapping integers in Python (lemmy.world)

submitted 1 year ago* (last edited 1 year ago) by jnovinger to c/python

15 comments fedilink hide all child comments

Yay or nay, memes should be allowed in [email protected] ?

you are viewing a single comment's thread
view the rest of the comments

[–] [email protected] 3 points 1 year ago (1 children)

a ^= b
b ^= a
a ^= b

[–] Hammerheart 1 points 1 year ago (1 children)

I'm gonna need you to elaborate on this one

[–] dmad 5 points 1 year ago* (last edited 1 year ago) (1 children)

xor has the property x ^ x = 0, and x ^ 0 = x. So, x ^ x ^ y = y

a' = a ^ b
b' = b ^ a' = b ^ (a ^ b) = a
a'' = (a ^ b) ^ a = b

This is pretty clever, I've never seen this for a swap.

[–] [email protected] 2 points 1 year ago

Couldn't have explained it better myself. I don't remember where exactly I first read about this trick, but it's mainly useful in C or Assembly, as you don't have to resort to using a third variable/register.