Mypy extension for VS Code
Runs mypy on Python code to provide type checking.
Runs on your entire workspace. (This is different from Microsoft's Python extension's mypy functionality which only lints each file separately, leading to incomplete type checking.)
Uses the mypy daemon to keep the analysis state in memory so that only changed files are rechecked.
Respects the active Python interpreter (set in the Python extension) and the mypy.ini configuration file.
Supports multi-root workspaces: will launch a separate mypy daemon for each workspace folder.
Installing mypy
This extension requires mypy to be installed on your system. To install mypy, run pip install mypy. There are other ways to install mypy, such as using pipx or your system's package manager.
By default, this extension relies on having the dmypy executable available on your PATH. This should be the case
if you installed mypy globally. To use a different mypy installation, set the mypy.dmypyExecutable setting.
Some people prefer to have mypy installed in each project's virtual environment rather than in a global location. To do this, enable mypy.runUsingActiveInterpreter.
Configuration
To configure mypy, you can create a mypy.ini file in your workspace folder (or any of the default locations). See mypy configuration file. You can also specify a custom path to mypy.ini using the mypy.configFile setting.
To configure the mypy-vscode extension, use the following VS Code settings:
mypy.targets: specify a list of target files or folders for mypy to analyze. By default the entire workspace folder is checked. You may prefer to use the files option in mypy.ini to specify which files mypy should analyze. In that case, you should set mypy.targets to an empty array ([]).
mypy.dmypyExecutable: Path to dmypy (the mypy daemon). Either a full path or just a name (which must exist in your PATH). You can use substitutions: ${workspaceFolder} and ~ (home directory).
mypy.runUsingActiveInterpreter: Use the active Python interpreter (selected in the Python extension) to run dmypy itself, instead of the mypy.dmypyExecutable setting. Note: your code is always checked against the active interpreter – this setting only controls the interpreter used to run dmypy itself.
mypy.configFile: Mypy config file, relative to the workspace folder. If empty, search in the default locations. See https://mypy.readthedocs.io/en/latest/config_file.html.
Note for users upgrading from an older version
Previously, this extension used mypyls (the Mypy Language Server). However, this is no longer the case: the extension now uses the mypy daemon directly. See the change log for details. If you have previously installed mypyls, the extension will continue to use mypy from that same installation. If you want, you can uninstall mypyls and install mypy separately.
Also, in previous versions this extension automatically enabled mypy's check_untyped_defs setting by default (see documentation). However, for consistency with mypy's defaults, the extension no longer does this. To re-enable this option, use the mypy config file.
License
This project is made available under the MIT License.
