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Questions tagged [pylance]

Pylance is an extension for Visual Studio Code that provides a language server for Python. When applying this tag to your question, consider also tagging it with [visual-studio-code] and/or [python].

Pylance is a language server to support the core Python extension for Visual Studio Code. Its aim is to help developers write Python code better and faster by providing auto-imports, semantic highlighting, built-in reporting of warnings and errors, strict type-checking, and method signatures with type information when displaying the popup Intellisense documentation.

It was first introduced in a post on Microsoft's Python development blog: Announcing Pylance: Fast, feature-rich language support for Python in Visual Studio Code:

To deliver an improved user experience, we’ve created Pylance as a brand-new language server based on Microsoft’s Pyright static type checking tool. Pylance leverages type stubs (.pyi files) and lazy type inferencing to provide a highly-performant development experience. Pylance supercharges your Python IntelliSense experience with rich type information, helping you write better code, faster. The Pylance extension is also shipped with a collection of type stubs for popular modules to provide fast and accurate auto-completions and type checking.

It was made available starting VS Code 1.49 (2020.8.0 (12 August 2020) release).

  1. Expose Pylance setting in python.languageServer. If Pylance extension is not installed, prompt user to install it. (#13122)

Installation is straightforward:

  1. Install the Pylance extension
  2. Configure your settings.json file 
    "python.languageServer": "Pylance",
  3. Open a .py file and the extension should activate

For more information:

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Duplicate problems in VS Code with Pylance

I am using Python 3.10.4 from an anaconda environment. The pylance version of my vscode is v2022.11.30. When I highlight something while editing I get duplicated suggestions from highlighting and also in dropdown suggestions. (as stated in the…
Sree
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Pylance: unexpected type inference for a union of two list types

Assume x has type list[int] | list[str], that is, it is either a list containing only ints or a list containing only strings. Then set(x) is either a set containing only ints, or a set containing only strings, so I would expect it to have the type…
Laikoni
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Pylance requiring explicit type on conformant list variables

I define a type as a Union of Literal strings Color = Literal[ "red", "green", "blue", "yellow", "orange", "purple" ] I have a function that expects a list of strings conforming to the type. def f(colors: List[Color]): …
Michael Moreno
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Pandas Series[Unknown] error when using Pylance

Using VSCode with Pylance, creating a basic series with pandas shown here will show an error. I looked around online and this question hasn't been asked yet, so I'm assuming I have some basic setup done incorrectly. Using conda, python@3.8.3,…
Farris Ismati
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vscode/pylance auto-import incorrect root path

Let's suppose that I have a project with this file structure: project_dir └── src ├── package1 │   └── module1.py └── package2 └── module2.py When I want to use some class from module1 in some other module I type something…
Anton M.
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Pylance autocompletion with subclasses

The problem is that in the following situation, autocompletion in the SubFoo class does not work in Pylance. Pylance only recognize the methods and attributes of the Bar class inside SubFoo class, but not the methods and attributes of the SubBar…
Stimpy
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How to make a class decorator friendly for pylance?

I'm using pylance and enabled the strict mode, and hoping for better developing experience. It works well until I define some class decorator def struct(cls : Type[Any]) -> Type[Any]: # ... do some magic here ... return…
luochen1990
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How to resolve Pylance "import could not be resolved" in VSCode Jupyter Notebook?

I am trying to import function query_creative inside of file query_creative.py into the notebook Notebook.ipynb. The file hierarchy is like this: ├───playground │ Notebook.ipynb ├───src ├───queries query_creative.py The…
Sanjin Juric Fot
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Proper way to show the docstring of descriptor with Pylance in VSCode

In my project I need to use user_id as field in many classes. So I try to concentrate the implementation by using a single descriptor instead of duplicating propertys everywhere. But there is still a subtle problem, Pylance in VSCode won't show the…
Starry-OvO
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How to declare a class variable without a value in a way that suppresses Pylance warning

I love the typechecker in Pylance (VS Code), but there seems to be a situation that I must choose between ignoring a Pylance warning and best practice for class variable declaration. Many times, class variables are initialized using a None type in…
Mark Travers
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Can I configure a common pyrightconfig.json in multi-root project? or alternatively Single-Folder with whitelist of included subdirectories?

I have a very large project directory which consists of about 2% python and 98% other stuff, including millions of files and hundreds of gigabytes of data. I want to use VSCode just for that 2% of python. The trouble is that the python files are…
uglycoyote
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Unable to install pylance

I have a fresh installation of vscode, python and anaconda on my laptop. In the extensions for vscode, i have installed the python extension. Pylance is supposed to be installed along with python, but it is stuck at installing and never…
Sharan Kumar
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How to ignore Python interactive window for linting in VSCode

I would like to disable linting for cells in the interactive window in Visual Studio Code. I don't see how it is beneficial, since it is not possible to manipulate cells which have already been run (which is different from *.ipynb notebooks). I…
Richard
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If there are multiple possible return values, should pyright automatically infer the right one, based on the passed arguments?

I have the following function: from lxml import etree from typing import Union def _get_inner_xml(element: Union[etree._Element, None]) -> Union[str, None]: if element is None: return None # See…
T-Dawg
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visual studio code with pylance cannot resolve imports while using docker

I set up visual studio code to use a docker instance provided to me. For some reason pylance cannot locate some of my imports even though I added the import path in the settings.json for user, container and workspace. I am wondering if anybody has…
axr 0284
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