| | | | Profiling and Making Apps Fast by Default
How do you plan for the performance of your Python applications? What does a performance budget entail, and where should you spend your resources? This week on the show, we speak with Den Odell about his new book “Fast by Default: Practical Performance Engineering.”
REAL PYTHON podcast
Migration Strategies for Going From pandas to Polars
How to scope a pandas to Polars migration, from a single performance-sensitive section to the whole pipeline, and how to execute a full migration by hand or with an LLM.
THIJS NIEUWDORP
The Top Open-Source Code Reviewer on Code-Review-Bench
PR-AF places #2 of 42 overall on Martian’s Code-Review-Bench, ahead of CodeRabbit, Copilot, and Devin. Roughly 3x more valid findings than the commercial tools, at ~10x lower cost per review. Verified findings only. Apache 2.0, self-hosted, runs on any open or closed model. Star & Deploy →
AGENTFIELDsponsor
When to Use NotImplemented
When should you return NotImplemented from a dunder method? Why not return False or raise an exception instead?
TREY HUNNER
Articles & Tutorials
Build a Plugin Architecture With a Pydantic and FastAPI
Learn how to build a plugin architecture across service boundaries using a shared Pydantic API contract. This article walks through registration-time validation, FastAPI endpoints, ownership and authorization decisions, and continuous health checks for independently deployed services.
PATRICKM.DE • Shared by Patrick Müller
Metadata Requests No Longer Tracked as PyPI Downloads
Previously, requests for information about a package on PyPI got counted as a download in the package statistics. This was recently changed to more accurately account only for the downloads of wheels, tar balls, and zip files. This article explains the change.
PYPI.ORG
Which AI Tools Are Worth Using? A Live Course for Python Devs With “No Time to Try Them Out”
 Stop stressing over every new AI coding tool release: in one live session on September 12 you learn which categories are worth it, which to skip, and a 60-second test that settles every launch after that. Reserve Your Spot →
REAL PYTHONsponsor
Build Your Own Face Recognition Tool With Python
In this tutorial, you’ll build your own face recognition command-line tool with Python. You’ll learn how to use face detection to identify faces in an image and label them using face recognition. With this knowledge, you can create your own face recognition tool from start to finish!
REAL PYTHON
How to Fix ‘NoneType’ Object Has No Attribute Errors
When Python throws AttributeError: ‘NoneType’ object has no attribute ‘x’, it reads like the interpreter is being deliberately unhelpful, but it’s actually telling you something precise: a variable you expected to hold an object turned out to be None.
SYSTEM CRAFT PRESS • Shared by Bob Morrison
Primer on Python Decorators
In this tutorial, you’ll look at what Python decorators are and how you define and use them. Decorators can make your code more readable and reusable. Come take a look at how decorators work under the hood and practice writing your own decorators.
REAL PYTHON
Type Checking Could Be the Guardrail Your Agent Is Missing
Coding agents write a lot of Python, and they write it fast. Having your agent call a typechecker can prevent common type bugs creeping in. Pyrefly is an open-source typechecker built in Rust that’s fast enough to keep up with your agent’s inference.
PYREFLY TEAMsponsor
Testing Async Python Without Losing Your Mind
Async Python testing patterns that actually work: event loop scope, async fixture lifecycle, and the specific pytest-asyncio / anyio patterns that break under default assumptions.
DEV.TO • Shared by Anonymous
Storing Django Static and Media Files on Cloudflare R2
This tutorial shows how to configure Django to load and serve up static and media files, public and private, via Cloudflare R2 an AWS S3-like cloud storage service.
NIK TOMAZIC
Analysis Paralysis Sucks
Junior developers don’t start because they don’t know enough. Senior developers don’t start because they know too many things that could go wrong. Both are stuck.
KEVIN RENSKERS
Async Programming in Python: From Generators to asyncio
Learn how Python async programming works. Write async functions with async and await, and run slow I/O operations concurrently with asyncio.
REAL PYTHON
Why OOP Exists
Learn the fundamental principles behind Object Oriented Programming (OOP) and how that connects to the Python syntax for class definition.
RODRIGO GIRÃO SERRÃO
Python 3.15 Preview: UTF-8 by Default
Preview the Python 3.15 UTF-8 default: see what changes, try it on a pre-release, and keep your file I/O portable across every platform.
REAL PYTHON
Quiz: Python 3.15 Preview: UTF-8 by Default
REAL PYTHON
Optimal Seating on the Airbus A380
Mark analyzes the results from a paper that determined the optimal seating arrangement on an Airbus A380.
MARK LITWINTSCHIK
Projects & Code
 Brought to you by Real Pythonsponsor
Online Python Training Created by Experts →
shedskin: Restricted-Python-to-C++ Transpiler
GITHUB.COM/SHEDSKIN
A Browser DOM, in Python!
GITHUB.COM/BYTEFACE • Shared by byteface
pandas-silent-bugs: 182 Examples Where pandas Is Wrong
GITHUB.COM/THIBAUDLEPAN77-SVG • Shared by Thibaud Lepan
mitti: Next-Gen ASGI Framework
GITHUB.COM/GRANDIMAM
jsonstore: Django JSONField Data as Virtual Model Fields
GITHUB.COM/VIEWFLOW
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