Pylance

Fast, feature-rich language support for Python

This repository is for providing feedback and documentation on the Pylance language server extension in Visual Studio Code. You can use the repository to report issues or submit feature requests. The Pylance codebase is not open-source but you can contribute to Pyright to make improvements to the core typing engine that powers the Pylance experience.

Quick Start

Install the Pylance extension from the marketplace.
Open a Python (.py) file and the Pylance extension will activate.

Features

Pylance provides some awesome features for Python 3, including:

Docstrings
Signature help, with type information
Parameter suggestions
Code completion
Auto-imports (as well as add and remove import code actions)
As-you-type reporting of code errors and warnings (diagnostics)
Code outline
Code navigation
Code lens (references/implementations)
Type checking mode
Native multi-root workspace support
IntelliCode compatibility
Jupyter Notebooks compatibility

See the changelog for the latest release.

Settings and Customization

Pylance provides users with the ability to customize their Python language support via a host of settings which can either be placed in the settings.json file in your workspace, or edited through the Settings Editor UI.

python.analysis.typeCheckingMode
- Used to specify the level of type checking analysis performed;
- Default: off
- Available values:
  - off: No type checking analysis is conducted; unresolved imports/variables diagnostics are produced
  - basic: Non-type checking-related rules (all rules in off) + basic type checking rules
  - strict: All type checking rules at the highest severity of error (includes all rules in off and basic categories)
python.analysis.diagnosticMode
- Used to allow a user to specify what files they want the language server to analyze to get problems flagged in their code.
- Available values:
  - workspace
  - openFilesOnly (default)
python.analysis.stubPaths
- Used to allow a user to specify a path to a directory that contains custom type stubs. Each package's type stub file(s) are expected to be in its own subdirectory.
- Default value: ./typings
python.analysis.autoSearchPaths
- Used to automatically add search paths based on some predefined names (like src).
- Available values:
  - true (default)
  - false
python.analysis.diagnosticSeverityOverrides
- Used to allow a user to override the severity levels for individual diagnostics should they desire
- Accepted severity values:
  - error (red squiggle)
  - warning (yellow squiggle)
  - information (blue squiggle)
  - none (disables the rule)
- Available rule to use as keys can be found here
- Example:
```
{
    "python.analysis.diagnosticSeverityOverrides": {
        "reportUnboundVariable": "information",
        "reportImplicitStringConcatenation": "warning"
    }
}
```
python.analysis.useLibraryCodeForTypes
- Used to parse the source code for a package when a typestub is not found
- Accepted values:
  - true (default)
  - false

Contributing

Pylance leverages Microsoft's open-source static type checking tool, Pyright, to provide performant language support for Python.

Code contributions are welcomed via the Pyright repo.

For information on getting started, refer to the CONTRIBUTING instructions.

Feedback

File a bug in GitHub Issues
Tweet us with other feedback

License

See LICENSE for more information.

Imaclean74 / pylance-release