(Python 3 is used for the duration of the article.) The Global Interpreter Lock It’s impossible to talk about concurrent programming in Python without mentioning the Global Interpreter Lock, or GIL.

The newly approved Python Enhancement Proposal 751 gives Python a standard lock file format for specifying the dependencies of projects. Here’s the what, why, and when.

Free-threaded Python is now officially supported, though using it remains optional. Here are four tips for developers getting started with true parallelism in Python.