Python Language Server for the Language Server Protocol
Python LSP Server
A Python 3.8+ implementation of the Language Server Protocol. (Note: versions <1.4 should still work with Python 3.6)
The base language server requires Jedi to provide Completions, Definitions, Hover, References, Signature Help, and Symbols:
pip install python-lsp-server
This will expose the command
pylsp on your PATH. Confirm that installation succeeded by running
If the respective dependencies are found, the following optional providers will be enabled:
- Rope for Completions and renaming
- Pyflakes linter to detect various errors
- McCabe linter for complexity checking
- pycodestyle linter for style checking
- pydocstyle linter for docstring style checking (disabled by default)
- autopep8 for code formatting
- YAPF for code formatting (preferred over autopep8)
- flake8 for error checking (disabled by default)
- pylint for code linting (disabled by default)
Optional providers can be installed using the
extras syntax. To install YAPF formatting for example:
pip install "python-lsp-server[yapf]"
All optional providers can be installed using:
pip install "python-lsp-server[all]"
If you get an error similar to
'install_requires' must be a string or list of strings then please upgrade setuptools before trying again.
pip install -U setuptools
Windows and Linux installation
If you use Anaconda/Miniconda, you can install
python-lsp-server using this conda command
conda install -c conda-forge python-lsp-server
Python-lsp-server is available in the repos of every major Linux distribution, and it is usually called
For example, here is how to install it in Debian and Debian-based distributions (E.g. Ubuntu, Pop!_OS, Linux Mint)
sudo apt-get install python3-pylsp
or Fedora Linux
sudo dnf install python-lsp-server
or Arch Linux
sudo pacman -S python-lsp-server
Only on Alpine Linux the package is named differently. You can install it there by typing this command in your terminal:
apk add py3-lsp-server
3rd Party Plugins
Installing these plugins will add extra functionality to the language server:
- pylsp-mypy: MyPy type checking for Python >=3.8.
- pyls-isort: code formatting using isort (automatic import sorting).
- python-lsp-black: code formatting using Black.
- pyls-memestra: detecting the use of deprecated APIs.
- pylsp-rope: Extended refactoring capabilities using Rope.
- python-lsp-ruff: Extensive and fast linting using ruff.
Please see the above repositories for examples on how to write plugins for the Python LSP Server.
cookiecutter-pylsp-plugin is a cookiecutter template for setting up a basic plugin project for python-lsp-server. It documents all the essentials you need to know to kick start your own plugin project.
Please file an issue if you require assistance writing a plugin.
Like all language servers, configuration can be passed from the client that talks to this server (i.e. your editor/IDE or other tool that has the same purpose). The details of how this is done depend on the editor or plugin that you are using to communicate with
python-lsp-server. The configuration options available at that level are documented in
python-lsp-server depends on other tools, like flake8 and pycodestyle. These tools can be configured via settings passed from the client (as above), or alternatively from other configuration sources. The following sources are available:
pycodestyle: discovered in
flake8: discovered in
The default configuration sources are
pyflakes. If you would like to use
flake8, you will need to:
pyflakes, by setting their corresponding
false. This will prevent duplicate linting messages as flake8 includes these tools.
- Change the
pylsp.configurationSourcessetting (in the value passed in from your client) to
['flake8']in order to use the flake8 configuration instead.
The configuration options available in these config files (
setup.cfg etc) are documented in the relevant tools:
Overall configuration is computed first from user configuration (in home directory), overridden by configuration passed in by the language client, and then overridden by configuration discovered in the workspace.
As an example, to change the list of errors that pycodestyle will ignore, assuming you are using the
pycodestyle configuration source (the default), you can:
Add the following to your ~/.config/pycodestyle:
[pycodestyle] ignore = E226,E302,E41
pylsp.plugins.pycodestyle.ignoreconfig value from your editor
Same as 1, but add to
setup.cfgfile in the root of the project.
Python LSP Server can communicate over WebSockets when configured as follows:
pylsp --ws --port [port]
The following libraries are required for Web Sockets support:
- websockets for Python LSP Server Web sockets using websockets library. refer Websockets installation for more details
You can install this dependency with command below:
pip install 'python-lsp-server[websockets]'
LSP Server Features
- Auto Completion
- Code Linting
- Code actions
- Signature Help
- Go to definition
- Find References
- Document Symbols
- Document Formatting
- Code folding
- Multiple workspaces
# (optional) create conda env conda create --name python-lsp-server python=3.11 -y conda activate python-lsp-server pip install -e ".[all,websockets,test]"
Run server with ws
pylsp --ws -v # Info level logging pylsp --ws -vv # Debug level logging
To run the test suite:
# requires: pip install ".[test]" (see above) pytest
After adding configuration options to
schema.json, refresh the
CONFIGURATION.md file with
python scripts/jsonschema2md.py pylsp/config/schema.json CONFIGURATION.md
This project is made available under the MIT License.
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