Bookmarks (446)

Flattening a List of Lists in Python In this video course, you’ll learn how to flatten a list of lists in Python. You’ll use different tools and techniques to accomplish this task. First, you’ll use a loop along with the .extend() method of list. Then you’ll explore other tools, including reduce(), sum(), itertools.chain(), and more. REAL PYTHON course

What’s New in Python 3.13 Python 3.13 has gone into beta, which means the feature freeze is now in place. This is the official listing of the new features in 3.13. This release includes changes to the REPL, new typing features, experimental support for disabling the GIL, dead battery removal, and more. PYTHON

[Webinar] Saga Pattern Simplified: Building Sagas with Temporal Join us on May 30th: we’ll give a brief overview of Sagas, including challenges and benefits. Then we’ll introduce you to Temporal and demonstrate how easy it is to build, test, and run Sagas using our platform and coding in your preferred language. Prior knowledge of Temporal is not required → TEMPORAL sponsor

Sets as Dictionaries With No Values A set is a built-in data type that provides fast lookup and insertion with characteristics similar to those of dictionary keys. This article explores the relationship between sets and dictionaries by implementing a set class. RODRIGO GIRÃO SERRÃO

A 100x Speedup With Unsafe Python This is a deep, in the weeds analysis of how different packages can store the same kinds of data in a different order, and how row-based vs column-based storage order can affect NumPy’s speed to process the data. The not often examined “strides” value of a NumPy array specifies how things are stored and this article shows an...

The New REPL in Python 3.13 Python 3.13 just hit feature freeze with the first beta release, and it includes a host of improvements to the REPL. Automatic indenting, block-level editing, and more make the built-in REPL more powerful and easier to use. TREY HUNNER

How to Read and Write Parquet Files With Python Apache Parquet files are a popular columnar storage format used by data scientists and anyone using the Hadoop ecosystem. By using the pyarrow package, you can read and write Parquet files, this tutorial shows you how. MIKE DRISCOLL

Generating Fake Django Model Instances With Factory Boy Writing good tests means having data to test with. The factory-boy library helps you create fake data that you can use with your tests. This article shows you how to use factory-boy with Django ORM models. AIDAS BENDORAITIS

Python Sequences: A Comprehensive Guide This tutorial dives into Python sequences, which is one of the main categories of data types. You’ll learn about the properties that make an object a sequence and how to create user-defined sequences. REAL PYTHON

How LLMs Work, Explained Without Math You’ve probably come across articles on Large Language Models (LLMs) and may have tried products like ChatGPT. This article explains how these tools work without resorting to advanced math. MIGUEL GRINBERG

Creating a Calculator With wxPython wxPython is a GUI toolkit for the Python programming language. This article introduces you to building GUIs by creating a personal calculator. MIKE DRISCOLL

Asyncio Run Multiple Concurrent Event Loops Ever wanted to add concurrency to your concurrency? You can run multiple asyncio event loops by using threading. This articles shows you how. JASON BROWNLEE

How Python asyncio Works: Recreating It From Scratch This article explains how asyncio works by showing you how to re-create it using generators and the __await__ method. JACOB PADILLA • Shared by Jacob Padilla

Comments on Understanding Software Nat responds to a presentation by C J Silverio on how software gets made at small to medium sized organizations. NAT BENNETT

TypeIs Does What I Thought TypeGuard Would Do in Python In this post, Redowan discusses the fact that TypeGuard has always confused him, and that the newer TypeIs feature does what he thought TypeGuard should do. Read on to learn about them both. REDOWAN DELOWAR

Python’s unittest: Writing Unit Tests for Your Code In this tutorial, you’ll learn how to use the unittest framework to create unit tests for your Python code. Along the way, you’ll also learn how to create test cases, fixtures, test suites, and more. REAL PYTHON

Webinar - Make Open Source Suck Less Tired of dependency conflicts, corrupted environments and “works on my machine” issues? Learn the shortfalls of standard package and environment tools (i.e. pip and venv), and how you can achieve reproducibility, dependency management and security at scale - Watch the Webinar On-Demand → ACTIVESTATE sponsor

Avoid Conflicts and Let Your OS Select a Python Web App Port Hard-coded port numbers can be problematic during development because they prevent you from running multiple instances of the same server process in parallel. This article explains how to work around this issue by letting your operating system automatically select a random port number. CHRISTOPH SCHIESSL • Shared by Christoph Schiessl

Quiz: The Python Calendar Module In this quiz, you’ll test your understanding of the calendar module in Python. It’ll evaluate your proficiency in manipulating, customizing, and displaying calendars directly within your terminal. By working through this quiz, you’ll revisit the fundamental functions and methods provided by the calendar module. REAL PYTHON

Quiz: What Is the __pycache__ Folder in Python? In this quiz, you’ll have the opportunity to test your knowledge of the __pycache__ folder, including when, where, and why Python creates these folders. REAL PYTHON

Everything Google’s Python Team Were Responsible For Google recently laid off the majority of their internal Python team. This post to HN, from one of the former team members, covers just what that team was responsible for. The ensuing discussion also includes comments from others on that team as well. HACKER NEWS

Working With Global Variables in Python Functions In this video course, you’ll learn how to use global variables in Python functions using the global keyword or the built-in globals() function. You’ll also learn a few strategies to avoid relying on global variables because they can lead to code that’s difficult to understand, debug, and maintain. REAL PYTHON course

Embarking on a Relaxed and Friendly Python Coding Journey Do you get stressed while trying to learn Python? Do you prefer to build small programs or projects as you continue your coding journey? This week on the show, Real Python author Stephen Gruppetta is here to talk about his new book, “The Python Coding Book.” REAL PYTHON podcast

How to Watermark a Graph With Matplotlib “Matplotlib is one of the most popular data visualization packages for the Python programming language. It allows you to create many different charts and graphs.” With it you can even put a watermark on your charts, this tutorial shows you how. MIKE DRISCOLL

Software Friction Friction is everywhere in software development. Two setbacks are more than twice as bad as one setback. This article discusses the sources of software friction and what you can do about it. HILLEL WAYNE

The Magician’s Sleight of Hand Even functions in Python are objects and can be re-assigned and manipulated. This article shows a problem that at first looks impossible, but can be handled with a few key re-assigments. STEPHEN GRUPPETTA • Shared by Stephen Gruppetta

4 Software Design Principles I Learned the Hard Way Leonardo talks about four principles of software engineering he’s learned though his career. Some are against common practice: DRY may not be you friend. LEONARDO CREED

Isolating Risk in the CPython Release Process This is a quick summary of the changes to the CPython build process to help reduce the risks caused by extra dependencies. SETH LARSON

Building Reusable Components in Django This tutorial looks at how to build server-side, reusable UI components in Django using the django-viewcomponent library. MICHAEL YIN • Shared by Michael Herman

PEP 686: Make UTF-8 Mode Default This Python Enhancement Proposal outlines making UTF-8 the default throughout Python. This takes the addition of Unicode introduced in Python 3 to its full extent, applying it to file encoding, pipes, and more. Mechanisms for other encoding are still supported. This PEP is targeted for Python 3.15. PEPS