Frozen sets in Python. I mentioned before how sets can only be made of things that are hashable. Since sets are mutable, they can’t themselves be used as set elements or dictionary keys.

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.

The preview WWBD extension emphasizes the experimental tool is very opinionated, noting, "While the supported project structures and workflows are considered common enough, do not be surprised if your ...