~pycoders | Issue #682: pylock.toml, NumPy, t-strings, and More (May 20, 2025) (29)

Going Beyond requirements.txt With pylock.toml What is the best way to record the Python dependencies for the reproducibility of your projects? What advantages will lock files provide for those projects? This week on the show, we welcome back Python Core Developer Brett Cannon to discuss his journey to bring PEP 751 and the pylock.toml file format to the community. REAL PYTHON podcast

I Don’t Like NumPy This opinion piece talks about why NumPy gets difficult fast. Two dimensions to your array? No problem, the calc is mostly self evident. Add a couple more dimensions and it gets messy fast. See also the associated HN discussion, which also includes possible solutions. DYNOMIGHT

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Unravelling t-strings PEP 750 introduced t-strings for Python 3.14. These are a template string mechanism similar to f-strings. Although they are in 3.14.0b1, there isn’t any documentation yet, so this post explains what they are how they can be used. BRETT CANNON

Working With Missing Data in Polars In this video course, you’ll learn how to deal with missing data in Polars to ensure it doesn’t interfere with your data analysis. You’ll discover how to check for missing values, update them, and remove them. REAL PYTHON course

Django Security Best Practices This guide contains a long list of best practices for securing your Django site. It includes topics such as ensuring HTTPS everywhere, hardening your database, using key built-in security features, and more. AHMAD SADEDDIN

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t-strings in Python (PEP 750) Python 3.14 will include the new t-string concept, an f-string like mechanism for string templating. Talk Python interviews Paul Everitt, David Peck, and Jim Baker and they talk about the upcoming feature. KENNEDY ET AL podcast

The Database Row That Did and Didn’t Exist Misty ran into a confounding bug, where loading and saving certain Django ORM objects was failing, but not all of them. Read on to understand what went wrong. MISTY DE MÉO

The Appearing Built-In Rodrigo discovered that examining the builtins module in the REPL changes the size of the builtins module. Read on to find what causes this oddity. RODRIGO GIRÃO SERRÃO

What Does @Slot() Do in Qt? When working with Qt slots and signals in PySide6 you might discover the @Slot decorator. This post tells you what it does and why you might use it. MARTIN FITZPATRICK

5 Steps to N-Body Simulation This article shows you how to simulate gravity in an N-body problem. It starts out with simpler simulation then adds optimizations as it goes along. ALVIN NG

PEPs & Co. A little bit of Python history: where the term “PEP” came from, along with a list of similar types of documents for other languages. HUGO VAN KEMENADE

The First Year of Free-Threaded Python A recap of the first year of work on enabling support for the free-threaded build of CPython in community packages. NATHAN GOLDBAUM

Pandas: Drop Columns by Name in DataFrames A quick overview of the variety of ways to drop columns from a pandas DataFrame, referencing the columns by name. ERIK MARSJA

Working on Complex Systems: What I Learned at Google Explore the key characteristics of complex systems and learn practical patterns for tackling complex problems. TEIVA HARSANYI

Building a Real-Time Dashboard With Flask and Svelte Learn how to build a real-time analytics dashboard using Flask and Svelte with server-sent events. AMIR TADRISI