#Python

I Built a Live ML Predictions Dashboard for the 2026 FIFA World Cup

The World Cup is finally here, and instead of just watching, I wanted to see how well a statistical model could keep up with the tournament in real time. So I built one. A live machine-learning predic…

SDK performance releases and proxy detection

What's new in Arcjet (2026-06-12). New versions for each of our JS, Python, and Go SDKs to improve performance and detect proxies.

A Temperature Converter

Asked to write a temperature converter in Python. Here's a flexible, extensible solution that handles Celsius, Fahrenheit, and Kelvin conversions. from abc import ABC, abstractmethod from enum import …

Remove Background Noise from Video Without Re-encoding: An Audio-Only Approach with DeepFilterNet3

A Python CLI tool that strips background noise from any video file using ML denoisers — while copying the video stream byte-for-byte. A 6 GB 4K file processes in minutes instead of hours.

A URL Shortener

A simple URL shortener that maps long URLs to short codes. Supports creating, retrieving, and expanding shortened URLs. import hashlib import string from abc import ABC, abstractmethod from typing imp…

selenium webdriver or cover for arbitrary GET requests

A Function That Estimates How Long a 5-Minute Fix Will Actually Take

Asked to write a function that estimates the true duration of a '5-minute fix.' Here's what came out after letting the abstraction instincts loose. from dataclasses import dataclass, field from enum i…

A Standup Meeting Summary Generator

Asked for a standup meeting summary generator in Python. Here's an implementation that takes team member updates and produces a formatted summary. from dataclasses import dataclass, field from typing …

An announcement from the Steering Council regarding the JIT project

Ultimate Guide to API Rate Limiting for Datadog

Read Datadog rate-limit headers, implement retries and throttling, batch requests, and monitor usage to avoid 429 errors.

DevHumor API: The Programmer’s Random Excuse Generator with Pluggable Validation Frameworks

A developer requested a simple tool to generate random excuses for why their code doesn't work. Instead of a 5-line function, we built an enterprise-grade excuse generator with abstract factory patter…

7 Ways New Engineers Can Flourish in the Age of AI

Build a Self-Aware Code Complexity Analyzer That Rates Your Own Shame Level

Create a tool that analyzes Python source code and assigns it a 'shame score' based on various code smell metrics, then generates brutally honest feedback about the developer's choices. The tool shoul…

OpenSSF Notes Quarter of Growth with New Members, Added AI Security Resources, and Growing Community

Structured concurrency & Go

How Python and Kotlin provide structured concurrency out of the box while Go achieves the same patterns explicitly using errgroup, WaitGroup, and context.

Move Along, Python

Deterministic, portable Python runtimes for Tiles using layered venvstacks.

Hierarchical rate limiting with Redis sorted sets

Build multi-level rate limiting with Redis sorted sets and Lua. Enforce global and category-specific limits with ZREMRANGEBYSCORE and ZCARD commands.

Running only a single instance of a process

Prevent multiple script instances with file locking. Use flock in Bash, fcntl in Python, and syscall.Flock in Go for single-instance processes.

Injecting Pytest fixtures without cluttering test signatures

Clean up pytest test signatures using @pytest.mark.usefixtures to inject implicit fixtures without autouse or unused parameter warnings.

Explicit method overriding with @typing.override

Catch method override errors at type-check time with Python's @override decorator from PEP 698, preventing typos and signature mismatches.

Quicker startup with module-level __getattr__

Speed up Python module imports with __getattr__ from PEP 562 for lazy loading, deprecation warnings, and dynamic attribute access.

Shades of testing HTTP requests in Python

Test HTTP requests in Python with pytest-httpx for full mocking, respx for pattern matching, or VCR.py for recording real responses.

Taming parametrize with pytest.param

Write readable parametrized tests with pytest.param for better test names, conditional skips, custom IDs, and structured test data.

Log context propagation in Python ASGI apps

Automatically tag Python logs with request context using middleware and contextvars for distributed tracing in ASGI web applications.

Please don't hijack my Python root logger

Avoid configuring Python's root logger in libraries; use named loggers with NullHandler to let application code control logging behavior.

TypeIs does what I thought TypeGuard would do in Python

Understand TypeIs vs TypeGuard in Python: TypeIs provides more intuitive type narrowing by narrowing both positive and negative branches.

Patching pydantic settings in pytest

Mock pydantic_settings in pytest tests by patching the settings class to prevent flaky tests from environment variable dependencies.

Eschewing black box API calls

Why you should define API response structures explicitly. Compare approaches in Python, JavaScript, and Go with Pydantic, Zod, and structs.

Annotating args and kwargs in Python

Properly annotate Python *args and **kwargs with heterogeneous types using Unpack, TypedDict, and modern type hints from PEP-692.

Statically enforcing frozen data classes in Python

Enforce immutable dataclasses at type-check time with @final decorator to catch mutations before runtime without frozen=True performance cost.

Debugging dockerized Python apps in VSCode

Set up VSCode debugger for containerized Python applications using debugpy. Step-by-step guide with Docker Compose and launch configurations.

Banish state-mutating methods from data classes

Why you shouldn't add state-mutating methods to Python dataclasses. Maintain semantic clarity and use dataclasses as pure data containers.

Taming conditionals with bitmasks

Replace complex nested conditionals with Python's enum.Flag and bitmasks for cleaner, more maintainable logic using bitwise operations.

Memory leakage in Python descriptors

Prevent memory leaks in Python descriptors by using weakref to avoid hard references that prevent garbage collection of validated objects.

Unix-style pipelining with Python's subprocess module

Build Unix-style command pipelines in Python using subprocess.run with stdout piping for efficient process chaining and output capture.

Enabling repeatable lazy iterations in Python

Create reusable generators by implementing __iter__ in a class, allowing multiple lazy iterations without memory overhead or repeated function calls.

Escaping the template pattern hellscape in Python

Replace inheritance-based template pattern with composition and Protocol types to create cleaner, testable Python code without namespace pollution.

Python dependency management redux

Modern Python dependency management using pip-tools, hatch, and PEP-621 for web apps and libraries with reproducible builds.

Implementing a simple traceroute clone in Python

Build a traceroute clone in Python using UDP and ICMP sockets to trace network packet routes and measure hop latency with TTL manipulation.

Sorting a Django queryset by a custom sequence of an attribute

Sort Django querysets by custom attribute sequences using Case and When expressions for database-level ordering with SQL CASE statements.