treyhunner

treyhunner, 11 months ago to django

A controversial #Django topic:

class-based views (CBVs) or function-based views (FBVs)? 🤔

I started with function-based views, but after a few years of using Django I pretty much moved fully to class-based views. Both have pros & cons (and vocal advocates).

The Django docs introduce FBVs first and then discusses CBVs as well as Django's built-in "generic class-based views" (GCBVs).

Django-REST-Framework also makes heavy use of CBVs.

But class-based views CAN be confusing.

#DjangoJune

treyhunner, 10 months ago to python

I wish #Python's string replace method allowed specifying "count" as a keyword argument.

>>> text = "Hello? Python?"
>>> text.replace("?", "!", count=1)

I find that more explicit than this:

>>> text.replace("?", "!", 1)
'Hello! Python?'

But the replace only allows positional arguments 🐍😢

treyhunner, 9 months ago to python

What #Python feature would you have trouble explaining to a new programmer?

(If you think you CAN explain that feature, feel free to reply to replies with your own new-programmer-oriented explanation)

treyhunner, 8 months ago to python

What's a #Python feature you wish existed but doesn't? 🤔

It can even be something others would think is absurd. 🛸

Dream big! 💭

treyhunner, 5 months ago to random

I'm an HTML First convert.

I've found a lot of value in Alpine.js and HTMX for front end interactivity and recently I've been really enjoying the ease of maintaining Tailwind styles.

I've also noticed that I'm able to easily throw a tiny bit of custom HTML with Alpine attributes in my markdown-powered CMS-ish system and it just works. No need to make something custom for small one-off situations.

https://html-first.com

treyhunner, 1 month ago to python

Self-taught programmers: what made the idea of "time complexity" really click for you? 🧮

Was there a video, blog post, book chapter, etc. that really acted as an ah-ha moment? 💡

#Python #programming

treyhunner, 2 months ago to python

My students often ask me whether they can see a list of every dunder method that #Python has. I've been meaning to compile a categorized list for years.

I finally did it.

Here's every dunder method in Python... all 115 of them! 🤯

https://pym.dev/every-dunder-method/

treyhunner, 10 months ago (edited 10 months ago) to django

What #Django idiom do you wish you'd known sooner?

Or, what's a Django feature that seems underused?

#DjangoJune

treyhunner, 4 days ago to random

#PyConUS friends who aren't attending the auction: come play Cabo with me tonight. I'd to teach you!

After the lightning talks, I plan to quickly eat tacos at Condados and then hang out in the Westin lobby and play Cabo. I won't be up too late though. See you tonight!

treyhunner, 9 months ago to python

If you were to mentor a beginner #Python coder, what would be your first lesson?

treyhunner, 13 days ago to python

What are your favorite #Python one liners?

treyhunner, 2 months ago (edited 2 months ago) to random

I've just updated my ~/.config/pip/pip.conf & my dotfiles repo to disallow pip installing outside virtual environments! 🎉

TIL 2 things about #Python's pip:

1. pip has a config file. If I ever knew this, I'd forgotten.

2. pip has an option that stops it from working outside of a virtual environment!

This is great for me because I use pipx and NEVER do global pip installs.

Info: https://unix.stackexchange.com/questions/492041/is-there-a-way-to-disable-pip-outside-of-a-virtual-environment

Thanks to @hynek's excellent uv video for this semi-related TIL 💜 https://youtu.be/_FdjW47Au30?si=5iRmMuWMdewRubNt

treyhunner, 10 months ago (edited 10 months ago) to random

It may be obvious that these are classes:

• tuple
• list
• dict
• set
• str
• int
• float
• bool

But did you know these "functions" are also classes?

• enumerate
• range
• zip
• reversed
• map
• filter
• super
• type
• property
• classmethod

Classes are callable, just as functions are: Python has no "new" keyword!

Callables may be classes or functions. And it's acceptable to refer to function-like callables as "functions", even if they're actually classes.

https://www.pythonmorsels.com/callables/

treyhunner, 8 months ago to python

Ever seen a variable with two underscores on either side (like_this)?

These variables define a contract between Python devs and the #Python interpreter.

Officially called special attributes, they're often called "dunder variables" colloquially.

Each dunder variable is typically used for one of two purposes:

1. Conveing information (metadata) to Python devs
2. Empowering Python devs to convey information to the Python interpreter

name is an example of 1.

repr is an example of 2.

treyhunner, 5 months ago (edited 5 months ago) to django

I just watched @pythonbynight's #DjancoCon talk on the current state of #HTMX in #Django and now I'm turn between trying out django-render-block, forge-htmx, and @carlton's django-template-partials.

https://github.com/clokep/django-render-block
https://github.com/forgepackages/forge-htmx
https://github.com/carltongibson/django-template-partials/

Anyone written a blog post or made a repository attempting to write the same HTMX-powered view(s) using all 3 of those packages? I'd love to compare and contrast them more directly.

Here's the talk:

https://www.youtube.com/watch?v=J0xES5wGjik

treyhunner, 1 month ago to python

What #Python meetups are still either meeting remotely or hosting remote talks?

treyhunner, 14 days ago (edited 14 days ago) to python

Python 3.13 beta 1 just landed.

My favorite new feature is the new #Python REPL.

Honestly, this may be my favorite feature since f-strings.

My write up on the differences between old and new REPLs:
https://treyhunner.com/2024/05/my-favorite-python-3-dot-13-feature/

treyhunner, 11 months ago to random

Let's start #DjangoJune, by talking Django learning 🏫

I often recommend the Django Girls tutorial followed by the official Django documentation.

Why Django Girls first? https://tutorial.djangogirls.org

The official Django tutorial is great, but it explains some features that aren't essential on your first day with Django. https://djangoproject.com/start/

The Django docs also assume Python knowledge & a general understanding of web development. The Django Girls tutorial makes few assumptions.

treyhunner, 7 months ago to python

What's your favorite #Python one-liner?

treyhunner, 2 months ago to python

What's a bit of #Python syntax that is technically unnecessary and yet you prefer to leave it in for readability's sake?

What about a bit of unnecessary syntax that you always prefer to remove?

treyhunner, 16 days ago to random

I started a project for searching Unicode characters from your terminal, similar to unicode.party and @sethmlarson's utf8.xyz (but as a TUI instead of a web app).

I initially thought I'd call the project "utf", but that has a name conflict on PyPI (due to similarity to utf7, utf9, etc. likely).

What would you suggest I name this project?

https://github.com/treyhunner/utf/issues/17

treyhunner, 15 days ago to random

The Python Morsels REPL (https://pym.dev/repl) now properly supports using Ctrl+D to stop standard input! A user recently tested out code that relied on sys.stdin.read() and ended up stuck without a way to send EOF.

Thanks @notsolonecoder for a 1.5 year old unmerged CPython PR that contained the keys to fixing this issue!

https://github.com/python/cpython/pull/97665

#Python

treyhunner, 7 months ago to python

Flattening a list-of-lists (or iterable-of-iterables) in #Python?

Take your pick.

1️⃣ nested loops

names = []
for g in groups:
for n in g:
names.append(n)

2️⃣ extend in a loop

names = []
for g in groups:
names.extend(g)

or +=:
names += g

3️⃣ comprehension or generator:

names = [
n
for g in groups
for n in g
]

4️⃣ chain.from_iterable

from itertools import chain
names = chain.from_iterable(groups)

More details plus one "bad" way: https://pym.dev/flatten-a-list-in-python/

treyhunner, 8 months ago to python

Knowing when to use a set in #Python can be VERY handy sometimes.

no_neighbors = [
n
for n in nums
if n-1 not in nums
and n+1 not in nums
]

If "nums" is a list of 500,000 numbers, this takes 54 minutes.

Convert "nums" to a set and this taken less than 1 second.

Why?

It's all about that "in" operator.

Checking for containment in a list requires looping over the whole list.

Checking for containment in a set uses the magic of hashing to return an answer without looping.

treyhunner, 2 days ago to random

Not one project is holding their sprint on the rooftop (4th floor). I feel like that's a missed opportunity here. #PyConUS

Tables outside on the fourth floor roof with a yellow bridge in the background