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LSP

See the pylsp server (also known as python-lsp/python-lsp-server) (listed in Language servers — Language Server Protocol integration for Jupyter[Lab]). In practice this tool is annoying; it installs a bunch of linters which just add a ton of noise.

It also requires less than JupyterLab 4.0, which has useful features. Ironically, the release jupyterlab-lsp 4.2.0 doesn’t support JupyterLab 4.0 (despite the numbering). However, this has recently changed (with at least jupyterlab-lsp 5.1.0).

For JupyterLab 4.0+ LSP support, see Language Server Protocol support — JupyterLab 4.3.0 documentation. In settings this is labeled “Experimental” suggesting it may be worth waiting for.