I’m one of the software developers with Open Law Library (http://www.openlawlib.org/). We needed our VS Code extension, Codify, to communicate with our codification engine (basically a compiler for laws) which is written in Python. So we needed a native Python language server. We found Palantir's excellent python-language-server, but instead of targeting Python directly, we needed one targeting legal XML. Basically, we needed a pythonic generic language server. Thus was born, pygls (pronounced like "pie glass").

Our goal with pygls is to make it incredibly easy for anybody to write a language server for anything in Python. We have created a thin pythonic layer over the Language Server Protocol - giving the developer the core of what they need without getting in the way. Currently, it targets Python 3.5+ and has support for sync, async and threaded (using an @thread decorator) features and commands.

Python is one of our favorite languages, and VS Code one of our favorite editors. We hope pygls will make it possible for people to build many new and exciting language servers that leverage the power, ecosystem, and flexibility of Python.

This wouldn't be possible without Daniel Elero's hard work. Thank you, Daniel!