PyCoder’s Weekly

Issue #726: Lazy Imports, Pydantic AI, Classes, and More (March 17, 2026)

2026-03-17T19:30:00+00:00

#726 – MARCH 17, 2026
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The Story of Python’s Lazy Imports

This article is about why lazy imports took 3 years and 2 attempts to be added to the language. From PEP 690’s rejection to PEP 810’s unanimous acceptance.
TECHLIFE

Pydantic AI: Build Type-Safe LLM Agents in Python

Learn how to use Pydantic AI to build type-safe LLM agents in Python with structured outputs, function calling, and dependency injection patterns.
REAL PYTHON

Agents as API Services, Not Prompt Chains.

Clone a working 100-agent Python system: Autonomous Engineering Team, Deep Security Auditor, or Adversarial Code Reviewer. Agents run as API services, discover each other at runtime. No DAGs, no glue code. Any model. Apache 2.0. Clone a Recipe →
AGENTFIELD.AI sponsor

When Are Classes Used in Python?

While you don’t often need to make your own classes in Python, they can sometimes make your code reusable and easier to read.
TREY HUNNER

Learn the Agentic Coding Workflow That Actually Works on Real Projects

65% of Python developers are stuck using AI for small tasks that fall apart on anything real. This 2-day live course (March 21-22 via Zoom) walks you through building a complete Python CLI app with Claude Code, from an empty directory to a shipped project on GitHub.
REAL PYTHON

Python Jobs

Python + AI Content Specialist (Anywhere)

Real Python

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Articles & Tutorials

Crafting and Editing in-Depth Tutorials at Real Python

What goes into creating the tutorials you read at Real Python? What are the steps in the editorial process, and who are the people behind the scenes? This week on the show, Real Python team members Martin Breuss, Brenda Weleschuk, and Philipp Acsany join us to discuss topic curation, review stages, and quality assurance.
REAL PYTHON podcast

The Optimization Ladder

Python loses every public benchmark by 21-875x. Cemrehan took the exact problems people use to dunk on Python and climbed every rung of the optimization ladder: from CPython version upgrades to Rust. Real numbers, real code, real effort costs.
CEMREHAN ÇAVDAR

Ship Voice Agents That Sound Like Human with Async

Async Voice API is a human-like low-latency text-to-speech API for real-time apps and agents. 15 languages, streaming-ready, integrations with n8n, LiveKit, Twilio. Top-ranked on the Hugging Face TTS Arena. From$0.50/hour with a 24/7 SLA. Try Now →
ASYNC sponsor

Lock the Ghost in `uv.lock`

In the software world, “remove” is not equal to “gone.” Take a short trip through how the Python Package Index handles removals and how you can lock a ghost package in an uv.lock file forever!
CERT.AT • Shared by Kamil Mańkowski

Comparing PDF Table Extraction Tools

This article explores three Python tools for PDF table extraction: Docling, Marker, and LlamaParse. Learn which handles merged cells and multi-level headers best.
CODECUT.AI • Shared by Khuyen Tran

What Is Code Review For?

This post explores just what you should and should not use code reviews for. Learn when to use linters to catch problems vs when human review is important.
GLYPH

Caching an Asyncio Function the Easy Way

Caching an async function is trickier than expected, this article walks through why that is and how to use Asyncio primitives to solve the problem.
CHANGS.CO.UK • Shared by Jamie Chang

Working With APIs in Python: Reading Public Data

Learn how to consume REST APIs with Python using the requests library, including authentication, query parameters, and handling responses.
REAL PYTHON course

Nobody Gets Promoted for Simplicity

Our industry often rewards complexity and ignores simplicity. In interviews, design reviews, and promotions. Here’s how to fix it.
TERRIBLE SOFTWARE

You Store Data and You Do Stuff With Data

This post explores the Object Oriented Programming mindset and why you want to associate your data with the operations upon it.
STEPHEN GRUPPETTA

pandas’ Public API Is Now Type-Complete

Marco tells the story of how his team helped make pandas’ public API type-complete, and how to prevent it from regressing.
MARCO GORELLI

Remove Extra Spaces

Learn how to remove extra spaces from a string using regex, string splitting, a fixed point, and itertools.groupby.
RODRIGO GIRÃO SERRÃO

CPython: 36 Years of Source Code

A graphical analysis of the growth of CPython’s codebase from its first commits to the present day
PYTHON.ORG

Projects & Code

100 Days, 100 MicroPython IoT Projects

GITHUB.COM/KRITISHMOHAPATRA • Shared by Kritish Mohapatra

OpenDocs: Turn Your README Into Documentation

GITHUB.COM/IOTEVERYTHIN

Cycast: Internet Radio Streaming Server

GITHUB.COM/LUKEB42

Crime-Related Datasets for Python

PYPI.ORG • Shared by Renzo Caceres Rossi

django-tasks-db: An ORM-based Backend for Django Tasks

GITHUB.COM/REALORANGEONE

Events

Weekly Real Python Office Hours Q&A (Virtual)

March 18, 2026
REALPYTHON.COM

PyData Bristol Meetup

March 19, 2026
MEETUP.COM

PyLadies Dublin

March 19, 2026
PYLADIES.COM

Chattanooga Python User Group

March 20 to March 21, 2026
MEETUP.COM

Claude Code for Python Developers: Hands-On Agentic Coding Course

March 21 to March 23, 2026
REAL PYTHON

PyCascades 2026

March 21 to March 23, 2026
PYCASCADES.COM

PythonAsia 2026

March 21 to March 24, 2026
PYTHONASIA.ORG

Happy Pythoning!
This was PyCoder’s Weekly Issue #726.
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Issue #725: Generators, init.py, Pointblank, and More (March 10, 2026)

2026-03-10T19:30:00+00:00

#725 – MARCH 10, 2026
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Invent Your Own Comprehensions in Python

Python doesn’t have tuple, frozenset, or Counter comprehensions, but you can invent your own by passing a generator expression to any iterable-accepting callable.
TREY HUNNER

What Does Python’s `init.py` Do?

Learn how Python’s __init__.py declares packages, initializes variables, simplifies imports, and controls what gets exported.
REAL PYTHON course

Replay: Where Developers Build Reliable AI

Replay is a practical conference for developers building real systems. The Python AI & versioning workshop covers durable AI agents, safe workflow evolution, and production-ready deployment techniques. Use code PYCODER75 for 75% off your ticket →
TEMPORAL sponsor

Validating Data With Pointblank in Python

Bad data results in bad choices. This article introduces you to Pointblank a data verification library.
MARK PITBLADO

PEP 825: Wheel Variants: Package Format (Added)

PYTHON.ORG

PEP 827: Type Manipulation (Added)

PYTHON.ORG

Python 3.12.13, 3.11.15 and 3.10.20 Released

PYTHON.ORG

Django Security Releases Issued: 6.0.3, 5.2.12, and 4.2.29

DJANGO SOFTWARE FOUNDATION

Python Jobs

Python + AI Content Specialist (Anywhere)

Real Python

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Articles & Tutorials

Guido Interviews Thomas Wouters

After last year’s release of the Python documentary, Guido decided to explore those contributors who weren’t mentioned. He’s started a written interview series with a variety of contributors over Python’s first 25 years. This interview is with Thomas Wouters.
GUIDO VAN ROSSUM

Using `tox` to Test Across Multiple Django Versions

tox is a popular testing tool that uses isolated virtual environments to put your code through its paces using different versions of Python. This post shows you how to use it to test your Django App across multiple versions of Django.
DJANGOTRICKS

What `asyncio` Primitives Get Wrong About Shared State

Aaron’s company tried Event, Condition, and Queue for handling concurrent shared state, but each one still breaks under real concurrency. This article is about the observable pattern that finally worked for them.
AARON HARPER

Deprecate Confusing APIs Like `os.path.commonprefix()`

In this opinion piece, Seth argues that os.path.commonprefix() is confusing due to its placement in the os.path module, and this results in security issues. He thinks it should be deprecated, read on to learn why.
SETH LARSON

Replacing `tox` With `uv`

UV is quickly becoming the only tool you need in Python, this article looks at how UV can be used to test different versions of dependencies replacing what is traditionally done with tox.
CHANGS.CO.UK • Shared by Jamie Chang

A History of Attempts to Eliminate Programmers

From COBOL in the 1960s to AI in the 2020s, every generation promises to eliminate programmers. Explore the recurring cycles of software simplification hype.
IVAN TURKOVIC

Building Rapidlog: Why I Made a 3x Faster Python Logger

Siddharth built a benchmark-focused Python logging implementation for high-concurrency workloads. This article tells you why and how it was done.
DEV.TO • Shared by Siddharth Pogul

How to Use the OpenRouter API to Access Multiple AI Models

Access models from popular AI providers in Python through OpenRouter’s unified API with smart routing, fallbacks, and cost controls.
REAL PYTHON

Quiz: Use the OpenRouter API to Access Multiple AI Models

REAL PYTHON

Automate Python Data Analysis With YData Profiling

Automate exploratory data analysis by transforming DataFrames into interactive reports with one command from YData Profiling.
REAL PYTHON

Quiz: Automate Python Data Analysis With YData Profiling

REAL PYTHON

Projects & Code

cinderx: High-Performance Python Runtime Extensions

GITHUB.COM/FACEBOOKINCUBATOR

usdatasets: Installable Collection of Datasets on USA

PYPI.ORG • Shared by Renzo Caceres Rossi

python_template: Modern Python Project Template

GITHUB.COM/MAMELI

django-lsp: Django Language Server Protocol Library

GITHUB.COM/ADAMGHILL

Events

Python asyncio Internals

March 10, 2026
LUMA.COM • Shared by Adarsh Divakaran

Weekly Real Python Office Hours Q&A (Virtual)

March 11, 2026
REALPYTHON.COM

Python Atlanta

March 12 to March 13, 2026
MEETUP.COM

PyConf Hyderabad 2026

March 14 to March 16, 2026
PYCONFHYD.ORG

DFW Pythoneers 2nd Saturday Teaching Meeting

March 14, 2026
MEETUP.COM

DjangoCologne

March 17, 2026
MEETUP.COM

PyCascades 2026

March 21 to March 23, 2026
PYCASCADES.COM

PythonAsia 2026

March 21 to March 24, 2026
PYTHONASIA.ORG

Happy Pythoning!
This was PyCoder’s Weekly Issue #725.
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[ Subscribe to 🐍 PyCoder’s Weekly 💌 – Get the best Python news, articles, and tutorials delivered to your inbox once a week >> Click here to learn more ]

Issue #724: Unit Testing Performance, Ordering, FastAPI, and More (March 3, 2026)

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

#724 – MARCH 3, 2026
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Unit Testing: Catching Speed Changes

This second post in a series covers how to use unit testing to ensure the performance of your code. This post talks about catching differences in performance after code has changed.
ITAMAR TURNER-TRAURING

Lexicographical Ordering in Python

Python lexicographically orders tuples, strings, and all other sequences, comparing element-by-element. Learn what this means when you compare values or sort.
TREY HUNNER

A Cheaper Heroku? See for Yourself

Is PaaS too expensive for your Django app? We built a comparison calculator that puts the fully-managed hosting options head-to-head →
JUDOSCALE sponsor

Start Building With FastAPI

Learn how to build APIs with FastAPI in Python, including Pydantic models, HTTP methods, CRUD operations, and interactive documentation.
REAL PYTHON course

PEP 743: Add Py_OMIT_LEGACY_API to the Python C API (Rejected)

PYTHON.ORG

DjangoCon US 2026 (Chicago) Call for Proposals Open

DJANGOCON.US

Python Jobs

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Real Python

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Articles & Tutorials

Serving Private Files With Django and S3

Django’s FileField and ImageField are good at storing files, but on their own they don’t let you control access. Serving files from S3 just makes this more complicated. Learn how to secure a file behind your login wall.
RICHARD TERRY

FastAPI Error Handling: Types, Methods, and Best Practices

FastAPI provides various error-handling mechanisms to help you build robust applications. With built-in validation models, exceptions, and custom exception handlers, you can build robust and scalable FastAPI applications.
HONEYBADGER.IO • Shared by Addison Curtis

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PyCoder’s Weekly

Issue #726: Lazy Imports, Pydantic AI, Classes, and More (March 17, 2026)

Python Jobs

Articles & Tutorials

Projects & Code

Events

Issue #725: Generators, __init__.py, Pointblank, and More (March 10, 2026)

Python Jobs

Articles & Tutorials

Projects & Code

Events

Issue #724: Unit Testing Performance, Ordering, FastAPI, and More (March 3, 2026)

Python Jobs

Articles & Tutorials

Projects & Code

Events

Issue #725: Generators, init.py, Pointblank, and More (March 10, 2026)