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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:

465 questions
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VSCode auto completion not working with python and pylance

Hey guys I have a problem in vscode I get no auto-completion (i am on windows) and this is a fresh install from vscode: but it should auto-complete to boat_parts Here are my only 2 extensions: This is my interpreter: This is my settings.json in…
joschma
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Resolving missing Pylance Imports with WSL

I am on Windows 10, running WSL Ubuntu as well. Visual Studio Code states that PyLance cannot resolve imports. My interpreter is the basic Python 3.11 .exe in Windows, not WSL. In WSL, I have activated a virtual environment and installed packages,…
Lucas Hill
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Uninstall Pylance and Flake8 from Visual Studio Code

I have been using Pylance and Flake8 for a while, but now I don’t think I need them anymore, and they’re bothering me a lot since there are a lot of rules to follow. How I uninstall them from my Visual Studio Code and even from my PC? I know there…
Thiago Brandão
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Typing class attributes with default value None - best practices?

I am trying to introduce type hints to legacy Python 2.7 code. Many classes declare class attributes with a default value of None (to avoid mutable defaults) and then assign the value in the constructor, like so: class Myclass(object): _myList =…
FvD
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Type hints with Python ^3.10 and Pylance for VSCode

I try to follow the new features for type hinting that came with Python 3.10. I use VSCode with the pylance extension. For instance I have a methos like this in a class: def execute( self, query: str, return_type: str | None = None ) ->…
Lewi Uberg
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I have pylance installed on Vscode but I keep getting a 'module could not be resolved' error. What could be the issue?

So, I have already checked and I already have pylance installed. I also did a pip install, same thing. A lot of imports don't work and get 'module could not be resolved' or something of that nature I have tried pip install. Shooting in the dark I…
Kay Yu
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Using VSCode, unable to import pytest or setuptools in venv

I have created and activated a virtual environment, and installed pytest using pip python3 -m venv venv source venv/bin/activate pip install -U pytest The following lines are creating import errors: import pytest import setuptools It's a tiny…
Ambassador Kosh
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Failed to update setting 'python.analysis.typeCheckingMode'. Error: Unable to write to Folder Settings because no resource is provided

I'm trying to use jupyter notebook on VScode but I can't import pandas and other libraries and I keep getting this error too when I try to switch on "Type checking: Failed to update setting 'python.analysis.typeCheckingMode'. Error: Unable to write…
Divine Jude
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[ was not closed when adding logic to dict value inside list

New to python but can't figure out why this isn't allowed: Pylance gives For line 2 "{" was not closed For line 4 [ was not closed For line 5 Parsing failed: 'invalid syntax drop_down_fields = [ { "checked": …
justaguy
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What "feature flag" is causing these "errors" to be called out in vscode?

I'm the only one on the team using VSCode seeing these and it's a very helpful thing that I would like to help everyone take advantage of, but I can't seem to find why they show up for me and no one else. But it doesn't flag anything for them, and…
boatcoder
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Jupyter showing syntax error on match case, stating that i need pylance 3.10 or newer, which is already installed and working

So, I've installed python 3.10.6 and everything works fine, even the match case where i get a syntax error works. So even though all my code works fine and is valid, my editor still marks it as invalid syntax for some reason. Any suggestions for how…
Stian
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Cant seem to fix this error in vscode : "(" was not closed

I have been trying to make visualizations using plotly dash and wanted to try out the first app example from the sites documentaion. I copied and pasted most of the code and made sure to make the correct indentations but seem to keep getting an…
Thapelo Chimfwembe
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Error in python code of undefined variable , but i have also define a function with this name

enter image description here In this code where I put startTask in self.ui.line it showing that i haven't defined it but in lower i define a function with this name . class Main(QMainWindow): def __init__(self): super().__init__() …
Arjun singh Rajput
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Why will my code not open a window in pygame?

It's supposed to just open the window so far, but during testing, it wouldn't open the window, although no errors are displayed. I've already tried using "pygame.disply.flip()" instead of update but that changed nothing. I get this in the terminal…
ark1
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ImageGrab is not accessed by pylance

Looking to use PILLOW (PIL) to do an imagegrab. The purpose of the imagegrab is to view a box on the screen to see incoming things in a flash game. I did pip install pillow in my terminal. I want to put from PIL import imagegrab When I put that…
OzzysSleeping
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