The Python extension is open source but Pylance isn't. Use Pyright (type checking ext which is essentially Pylance without the ML stuff) instead of Pylance. In

The Python extension is open source but Pylance isn't. Use Pyright (type checking ext which is essentially Pylance without the ML stuff) instead of Pylance. Instead of Microsoft's C/C++ extension use clangd. Remote SSH and Remote Containers have alternatives as well but nothing as good. Google and Red Hat's extensions work out of the box along with several thousand other extensions.