PyCoder’s Weekly

Issue #729: NumPy Music, Ollama, Iterables, and More (April 7, 2026)

2026-04-07T19:30:00+00:00

#729 – APRIL 7, 2026
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NumPy as Synth Engine

Kenneth has “recorded” a song in a Python script. The catch? No sampling, no recording, no pre-recorded sound. Everything was done through generating wave functions in NumPy. Learn how to become a mathematical musician.
KENNETH REITZ

How to Use Ollama to Run Large Language Models Locally

Learn how to use Ollama to run large language models locally. Install it, pull models, and start chatting from your terminal without needing API keys.
REAL PYTHON

Ship AI Agents With Accurate, Fresh Web Search Data

Stop building scrapers just to feed your AI app web search data. SerpApi returns structured JSON from Google and 100+ search engines via a simple GET request. No proxy management, no CAPTCHAs. Power product research, price tracking, or agentic search in minutes. Used by Shopify, NVIDIA, and Uber →
SERPAPI sponsor

Indexable Iterables

Learn how objects are automatically iterable if you implement integer indexing.
RODRIGO GIRÃO SERRÃO

Claude Code for Python Developers (Live Course)

“This is one of the best training sessions I’ve joined in the last year across multiple platforms.” Two-day course where you build a complete Python project with an AI agent in your terminal. Next session April 11–12.
REAL PYTHON

PEP 803: `"abi3t"`: Stable ABI for Free-Threaded Builds (Accepted)

PYTHON.ORG

PEP 829: Structured Startup Configuration via .site.toml Files (Added)

PYTHON.ORG

Articles & Tutorials

Fire and Forget at Textual

In this follow up to a previous article (Fire and forget (or never) with Python’s asyncio, Michael discusses a similar article by Will McGugan as it relates to Textual. He found the problematic pattern in over 500K GitHub files.
MICHAEL KENNEDY'

pixi: One Package Manager for Python Libraries

uv is great for pure Python projects, but it can’t install compiled system libraries like GDAL or CUDA. pixi fills that gap by managing both PyPI and conda-forge packages in one tool, with fast resolution, automatic lockfiles, and project-level environments.
CODECUT.AI • Shared by Khuyen Tran

Dignified Python: Pytest for Agent-Generated Code

Learn how to define clear pytest patterns for agent-generated tests: separate fast unit vs integration, use fakes, constrain generation, and avoid brittle patterns to keep tests reliable and maintainable →
DAGSTER LABS sponsor

Learning Rust Made Me a Better Python Developer

Bob thinks that learning Rust made him a better Python developer. Not because Rust is better, but because it made him think differently about how he has been writing Python. The compiler forced him to confront things he’d been ignoring.
BOB BELDERBOS • Shared by Bob Belderbos

Django `bulk_update` Memory Issue

Recently, Anže had to write a Django migration to update hundreds of thousands of database objects. With some paper-napkin math he calculated it could fit in memory, but that turned out not to be the case. Read on to find out why.
ANŽE'S BLOG

Catching Up With the Python Typing Council

Talk Python interviews Carl Meyer, Jelle Zijstra, and Rebecca Chen, three members of the Python Typing Council. They talk about how the typing system is governed and just how much is the right amount of type hinting in your code.
TALK PYTHON podcast

Python 3.3: The Version That Quietly Rewired Everything

yield from, venv, and namespace packages are three features from Python 3.3 that looked minor when they came out in 2012, but turned out to be the scaffolding modern Python is built on.
TUREK SENTURK

Incident Report: LiteLLM/Telnyx Supply-Chain Attacks

This post from the PyPI blog outlines two recent supply chain attacks, how they were different, and how you can protect yourself from future incidents.
PYPI.ORG

Python Classes: The Power of Object-Oriented Programming

Learn how to define and use Python classes to implement object-oriented programming. Dive into attributes, methods, inheritance, and more.
REAL PYTHON

Timesliced Reservoir Sampling for Profilers

Reservoir sampling lets you pick a sample from an unlimited stream of events; learn how it works, and a new variant useful for profilers.
ITAMAR TURNER-TRAURING

Adding Python to PATH

Learn how to add Python to your PATH environment variable on Windows, macOS, and Linux so you can run Python from the command line.
REAL PYTHON course

Projects & Code

OracleTrace: Visualize Function Flows

GITHUB.COM/KAYKCAPUTO • Shared by Kayk Aparecido de Paula Caputo

Events

Weekly Real Python Office Hours Q&A (Virtual)

April 8, 2026
REALPYTHON.COM

PyCon Lithuania 2026

April 8 to April 11, 2026
PYCON.LT

Python Atlanta

April 9 to April 10, 2026
MEETUP.COM

DFW Pythoneers 2nd Saturday Teaching Meeting

April 11, 2026
MEETUP.COM

PyCon DE & PyData 2026

April 14 to April 18, 2026
PYCON.DE

DjangoCon Europe 2026

April 15 to April 20, 2026
DJANGOCON.EU

PyTexas 2026

April 17 to April 20, 2026
PYTEXAS.ORG

Happy Pythoning!
This was PyCoder’s Weekly Issue #729.
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Issue #728: Django With Alpine, Friendly Classes, SQLAlchemy, and More (March 31, 2026)

2026-03-31T19:30:00+00:00

#728 – MARCH 31, 2026
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Django Apps With Alpine AJAX, Revisited

The author has been modifying his approach to Django projects with Alpine AJAX over the last nine months. This post describes what he’s changed and how his process has improved.
LOOPWERK

Making Friendly Classes

What’s a friendly class? One that accepts sensible arguments, has a nice string representation, and supports equality checks. Read on to learn how to write them.
TREY HUNNER

Right-Size Your Celery & RQ Workers

CPU doesn’t tell you if tasks are piling up. Queue latency does. Autoscale your workers based on the metric that matters →
JUDOSCALE sponsor

Understanding CRUD Operations in SQL

Learn how CRUD operations work in SQL by writing raw SQL queries with SQLite and using SQLAlchemy as an ORM in Python.
REAL PYTHON course

Starlette 1.0 Released

MARCELOTRYLE.COM

PyCon Austria April 19-20, Registrations Open

PYCON.AT • Shared by Horst JENS

PyOhio 2026 Call for Proposals Now Open!

PRETALX.COM • Shared by Anurag Saxena

Articles & Tutorials

When Vectorized Arrays Aren’t Enough

This is a deep dive post about vectorized arrays in NumPy and how some optimizations work and some do not. There is also a follow-up as well: Vectorized Hardware Instructions Rule Everything Around Me.
NRPOSNER

Zensical: A Modern Static Site Generator

Talk Python interviews Martin Donath a contributor to MKDocs and recent creator of the new Zensical package. They talk about why he has built something new and what lessons he’s applied to the new project.
TALK PYTHON podcast

Dignified Python: 10 Rules to Improve your LLM Agents

At Dagster, we created “Dignified Python” to improve LLM-generated code by embedding clear coding principles into prompts. Instead of messy, pattern-based output, our agents produce code that reflects intent, consistency, and team standards. Here are the 10 rules from our Claude prompt →
DAGSTER LABS sponsor

Smello for HTTP Requests

Roman built Smello, an open-source tool that captures outgoing HTTP requests from your Python code and displays them in a local web dashboard. Learn why he did it and how he uses it to debug API access.
ROMAN IMANKULOV

Gotchas With SQLite in Production

What you need to know before putting a Django project that uses SQLite in production. This is part 5 of a series that includes information on write-ahead logging, locking errors, performance, and more.
ANŽE

Comparing Portable DataFrame Tools in Python

This article explores three tools for DataFrame portability in Python: Ibis, Narwhals, and Fugue. Learn when to use each to write code that runs across multiple backends.
CODECUT.AI • Shared by Khuyen Tran

Lessons From Pyre That Shaped Pyrefly

Pyrefly is a Python type checker from the same team that developed pyre. This article discusses lessons from developing Pyre that influenced how they designed Pyrefly.
PYREFLY

Connecting MongoDB to Python

This tutorial is a hands-on introduction to connecting MongoDB with Python using PyMongo, guiding readers through the essential first steps in just 10 minutes.
ANAIYA RAISINGHANI • Shared by Tony Kim

How Do Large Companies Manage CI/CD at Scale?

What changes for CI/CD when your company grows to hundreds of developers, dozens of services, and thousands of daily builds?
PETE MILORAVAC

Apply to Join the PSF Meetup Pro Network

The PSF helps support approved Python Meetup groups and the process to become one has recently been re-opened.
PYTHON SOFTWARE FOUNDATION

Inspect a Lazy Import in Python 3.15

This quick “things I learned” post shows you how to inspect a lazy import object in Python 3.15.
MATHSPP.COM

Projects & Code

syrupy: The Sweeter pytest Snapshot Plugin

GITHUB.COM/SYRUPY-PROJECT

pendulum: Python Datetimes Made Easy

GITHUB.COM/PYTHON-PENDULUM

validatedata: An Easier Way to Validate Data in Python

GITHUB.COM/EDWARD-K1

awesome-marimo: Curated List of Awesome Marimo Things

GITHUB.COM/MARIMO-TEAM

dj-urls-panel: Visualize URL Routes in the Django Admin

GITHUB.COM/YASSI

Events

Weekly Real Python Office Hours Q&A (Virtual)

April 1, 2026
REALPYTHON.COM

Canberra Python Meetup

April 2, 2026
MEETUP.COM

Sydney Python User Group (SyPy)

April 2, 2026
SYPY.ORG

Python Leiden User Group

April 2, 2026
PYTHONLEIDEN.NL

PyDelhi User Group Meetup

April 4, 2026
MEETUP.COM

Melbourne Python Users Group, Australia

April 6, 2026
J.MP

PyBodensee Monthly Meetup

April 6, 2026
PYBODENSEE.COM

PyCon Lithuania 2026

April 8 to April 11, 2026
PYCON.LT

Happy Pythoning!
This was PyCoder’s Weekly Issue #728.
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Issue #727: Sunsetting Jazzband, Spyder, A/B Testing, and More (March 24, 2026)

2026-03-24T19:30:00+00:00

#727 – MARCH 24, 2026
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Sunsetting Jazzband

Jazzband is (was) an Open Source cooperative for creating and maintaining projects. It maintained over 70 projects many of which were for the Django ecosystem. They included django-redis, django-nose, django-taggit, and loads more. Jazzband’s model has become untenable from the mass of AI submissions, and so it is winding down.
JAZZBAND.CO

Spyder: Your IDE for Data Science Development in Python

Learn how to use the Spyder IDE, a Python code editor built for scientists, engineers, and data analysts working with data-heavy workflows.
REAL PYTHON

How Nordstrom Built Self-Healing Docs with AI Agents

What if your docs updated themselves from Slack conversations? Join our webinar to learn how Nordstrom uses Temporal and AI agents to detect knowledge gaps, extract insights from chat history, and automatically generate pull requests →
TEMPORAL sponsor

Comparing Python Packages for A/B Test Analysis

A practical comparison of tea-tasting, Pingouin, statsmodels, and SciPy for A/B test analysis, with code examples.
EVGENY IVANOV

PyCon US 2026 Conference Schedule Announced

PYCON.ORG

Python Jobs

Python + AI Content Specialist (Anywhere)

Real Python

More Python Jobs >>>

Articles & Tutorials

Guido Interviews Brett Cannon

After last year’s release of the Python documentary, Guido decided to explore those contributors who weren’t mentioned. He now has an going series of written interviews with a variety of contributors from Python’s first 25 years. This interview is with Brett Cannon.
GUIDO VAN ROSSUM

“Requests” Needs You to Test Type Hints

Requests is a popular HTTP client library and is frequently in the top 10 PyPI downloads. There is an on-going effort to add type hinting to the library and to make sure the next release causes few issues, they need help testing.
SETH LARSON

Depot CI: Built for the Agent era

Depot CI: A new CI engine. Fast by design. Your GitHub Actions workflows, running on a fundamentally faster engine — instant job startup, parallel steps, full debuggability, per-second billing. One command to migrate →
DEPOT sponsor

Fire and Forget (Or Never) With Python’s Asyncio

Python’s asyncio.create_task() can silently garbage collect fire-and-forget tasks in 3.12+, meaning they might never run. This article shows you how to use the background tasks set pattern to fix it.
MICHAEL KENNEDY

Thoughts on OpenAI Acquiring Astral

Astral is the organization behind popular Python tools such as uv, ruff, and ty. Recently it was announced that OpenAI would be acquiring Astral. This opinion piece discusses the possible impact.
SIMON WILLISON

Standard Error

Standard error is one of the two writable file streams that is used for printing errors, warning messages, or any outputs that shouldn’t be mixed with the main program.
TREY HUNNER

🎓 Master Python’s Core Principles (Live Course)

Transform your Python skills in just eight weeks, with live expert guidance. No more second-guessing if your code is “Pythonic enough.” Master Python’s object model, advanced iteration, decorators, and clean system design through live instruction and hands-on practice in a small group setting:
REAL PYTHON sponsor

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