jupyterlab-lsp | Coding assistance for JupyterLab | Code Editor library

For more extensive installation instructions, see the documentation. For the current stable version, the following steps are recommended. Use of a python virtualenv or a conda env is also recommended.
install python 3 conda install -c conda-forge python=3
install JupyterLab and the extensions conda install -c conda-forge 'jupyterlab>=3.0.0,<4.0.0a0' jupyterlab-lsp # or pip install 'jupyterlab>=3.0.0,<4.0.0a0' jupyterlab-lsp Note: jupyterlab-lsp provides both the server extension and the lab extension. Note: With conda, you could take advantage of the bundles: jupyter-lsp-python or jupyter-lsp-r to install both the server extension and the language server.
install LSP servers for languages of your choice; for example, for Python (pylsp) and R (languageserver) servers: # note: you may want to use our fork of python-language-server instead (see below) pip install 'python-lsp-server[all]' R -e 'install.packages("languageserver")' or from conda-forge conda install -c conda-forge python-lsp-server r-languageserver Please see our full list of supported language servers which includes installation hints for the common package managers (npm/pip/conda). In general, any LSP server from the Microsoft list should work after some additional configuration. Note 1: it is worth visiting the repository of each server you install as many provide additional configuration options. Note 2: we are developing an improved (faster autocompletion, added features) version of the python-language-server. It is experimental and should not be used in production yet, but will likely benefit individual users You can check it out with: pip install git+https://github.com/krassowski/python-language-server.git@main Please report any regressions here.
(Optional, IPython users only) to improve the performance of autocompletion, disable Jedi in IPython (the LSP servers for Python use Jedi too). You can do that temporarily with: %config Completer.use_jedi = False or permanently by setting c.Completer.use_jedi = False in your ipython_config.py file. You will also benefit from using experimental version of python-language-server as described in the Note 2 (above).
(Optional, Linux/OSX-only) to enable opening files outside of the root directory (the place where you start JupyterLab), create .lsp_symlink and symlink your /home, or any other location which includes the files that you wish to make possible to open in there: mkdir .lsp_symlink cd .lsp_symlink ln -s /home home If your user does not have sufficient permissions to traverse the entire path, you will not be able to open the file. A more detailed guide on symlinking (written for a related jupyterlab-go-to-definition extension) is available here.