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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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Pylance Intellisense not working as expected with Django

I'm trying to understand how to configure Pylance to make it work correctly in my Django project. Below is one of many examples where Pylance is not able to find what I'm looking for. Here, I obviously need models from django.db. But there are only…
David Dahan
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How to switch vscode to use pylance rather than jedi?

I am trying to use match/case from python 3.10, but jedi doesn't support the syntax. I've heard pylance is better, but I can't find any way to switch vscode to pylance. I've downloaded the default Python extension, but only the jedi language server…
Marcus Hagberg
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VS Code Pylance not highlighting variables and modules

I'm using VS Code with the Python and Pylance extensions. I'm having a problem with the Pylance extension not doing syntax highlight for things like modules and my dataframe. I would expect the modules at the top to be colored green and the df…
MyNameHere
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How can I to get subclass return types when calling functions defined on the base class?

I'm trying to write a class hierarchy in Python so that subclasses can override a method predict to have a more narrow return type which is itself a subclasses of the parent's return type. This seems to work fine when I instantiate an instance of…
jkelle
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What does the symbol @ mean in Python type hinting?

As shown in image below, what do _S@map and _T@map mean? Additional information: Looking at multiprocessing.Pool.map definition there is not type hints, so the types above must be automatically generated by Pylance, which is the language server I…
Leonardus Chen
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VSCode. Pylance doesn't work via SSH connection

There is a problem: Pylance (IntelliSense) does not work on the remote server. At the same time it works locally. Pylance itself is installed both locally and on the server. Imports are just white and only "Loading..." pops up when I hover over it.…
Huginn
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How to show and ignore Pyright error codes

I am using pyright type checker and need to suppress warnings where e.g. numpy type stubs are insufficient to infer correct types. This can be accomplished with #type: ignore comment. However, I'd like any other issue to still be highlighted on the…
Boschie
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Auto save adds two empty lines between comment and function header in Python in VS code

I write code in Python in VS code. If I add comment before function and hit save button, VS code adds two empty lines: # comment def MyMethod(): return 0 In settings I see that I use autopep8 formatter: I wasnt able to find what causes this…
vytaute
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Pylance: "property" is incompatible with "int"

from typing_extensions import Protocol class IFoo(Protocol): value: int class Foo(IFoo): @property def value(self) -> int: return 2 _value: int @value.setter def value(self, value: int): self._value =…
vacih86456
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How to fix pylance syntax highlighting showing wrong color for self and cls python class parameters in VSCode with enabled default theme

I have encountered this issue when I use Pylance and syntax highlighting is enabled for python in the VSCode with default or the visual studio theme. self and cls parameter are LightSkyBlue color like other parameters It should be like this:
Pedram Elmi
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Pylance: Import "requests.packages.urllib3.util.retry" could not be resolved from source

I have the following line in my project from requests.packages.urllib3.util.retry import Retry Everything related to requests works with no problem, even the Retry from requests import Session from requests.adapters import HTTPAdapter from…
Rodrigo
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How to strongly type the "value" attribute to be str or a custom type?

When using the Pylance (ms-python.vscode-pylance) VS Code extension in strict type checking mode, I get a type error on my custom Enum value for the following code: def println_ctrl_sequence(message: str, ctrlSequence: Union[ANSICtrlSequence,…
Onyr
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VSCode Pylance auto import only prompt for typing

I am using vscode python and pylance extension. Half a month ago, everything was wonderful, when I typed pandas without importing it, I can press cmd + . to show quick fixes but now I cannot. Besides, pylance says it has an auto import function,…
Ramblestsad
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Add SageMath to pylance

I am using VSCode to write some SageMath code in a Jupyter notebook. Everything works fine and I can run my code but Pylance underlines all Sage imports and reports them as missing I have tried adding the path…
Giorgos Giapitzakis
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VScode Pylance python file path autocompletion

Recently I've installed pylance server (earlier I used Jedi), but it turned out that I have my file path autocompletion turned off. In Jedi it is out-of-box. How can I enable this option? Jedi: Pylance: I tried setting up…
RegreTTO
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