November 21, 2025

Building a FastAPI Application & Exploring Python Concurrency

35 minutes

What are the steps to get started building a FastAPI application? What are the different types of concurrency available in Python? Christopher Trudeau is back on the show this week, bringing another batch of PyCoder’s Weekly articles and projects.

We discuss a recent Real Python step-by-step tutorial about programming a FastAPI example application. You practice installing FastAPI, building your first endpoints, adding path and query parameters, and validating endpoints using Pydantic.

Christopher covers updates to his Real Python video course about concurrency in Python. The course digs into what concurrency means in Python and why you might want to incorporate it in your code. He describes the different methods and demonstrates how to approach coding using threading, asyncio, and multiprocessing.

We also share several other articles and projects from the Python community, including a news roundup, the PSF fundraiser campaign for 2025, where Python stores attributes, performance hacks for faster Python code, a project to transform functions into a web interface, and a Python disk-backed cache.

Course Spotlight: Python Descriptors

Learn what Python descriptors are, how the descriptor protocol works, and when descriptors are useful, with practical, hands-on examples.

Topics:

00:00:00 – Introduction

00:02:18 – Django Security Release

00:02:46 – Django Is Now a CVE Numbering Authority (CNA)

00:03:53 – An Annual Release Cycle for Django

00:04:12 – PEP 810: Explicit Lazy Imports (Accepted)

00:04:27 – PSF Board Office Hour Sessions for 2026

00:05:42 – PyCon US 2026: Call for Proposals Open

00:06:15 – PSF Fundraiser campaign for 2025

00:10:12 – A Close Look at a FastAPI Example Application

00:16:36 – Speed Up Python With Concurrency

00:21:08 – __dict__: Where Python Stores Attributes

00:25:59 – Video Course Spotlight

00:27:17 – 10 Smart Performance Hacks for Faster Python Code

00:29:56 – FuncToWeb: Transform Python Functions Into a Web Interface

00:32:48 – python-diskcache: Python Disk-Backed Cache

00:34:07 – Thanks and goodbye

News:

Django Security Release: 5.2.8, 5.1.14, and 4.2.26

Django Is Now a CVE Numbering Authority (CNA)

An Annual Release Cycle for Django - Buttondown

PEP 810: Explicit Lazy Imports (Accepted)

PSF Board Office Hour Sessions for 2026

PyCon US, Long Beach CA, 2026: Call for Proposals Open

PSF Fundraiser campaign for 2025

Connecting the Dots: Understanding the PSF’s Current Financial Outlook

Show Links:

A Close Look at a FastAPI Example Application – Set up a FastAPI example app, add path and query parameters, and handle CRUD operations with Pydantic for clean, validated endpoints.

Speed Up Python With Concurrency – Learn what concurrency means in Python and why you might want to use it. You’ll see a simple, non-concurrent approach and then look into why you’d want threading, asyncio, or multiprocessing.

__dict__: Where Python Stores Attributes – Most Python objects store their attributes in a __dict__ dictionary. Modules and classes always use __dict__, but not everything does.

10 Smart Performance Hacks for Faster Python Code – Some practical optimization hacks, from data structures to built-in modules, that boost speed, reduce overhead, and keep your Python code clean.

Projects:

FuncToWeb: Transform Python Functions Into a Web Interface

python-diskcache: Python Disk-Backed Cache

Additional Links:

Become a Member of the PSF - Python Software Foundation

FastAPI

Welcome to Pydantic

Quiz: A Close Look at a FastAPI Example Application – Practice FastAPI basics with path parameters, request bodies, async endpoints, and CORS. Build confidence to design and test simple Python web APIs.

Diskcache, more than caching - Bite code!

Level up your Python skills with our expert-led courses:

Python REST APIs With FastAPI

Python Descriptors

Speed Up Python With Concurrency

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