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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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VSCode and Pylance not running module matplotlib appropriately

I need to use the external module, matplotlib. I installed it using the command prompt with the line pip install matplotlib. I then added ./source to the "python.analysis.extraPaths" section of the settings.json file in the VSCode workbench. Now,…
Ale
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error "time" is not defined: UndefinedVariable

def time_stats(df): start_time = time.time() When I run this code in VS Code it does run fine, however "time" is underlined: and if I hover with the mouse there, I see an error message from PyLance that states: "time" is not defined:…
maud
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I have a plot embedded in my Tkinter GUI, Im trying to add to the plot a crosshair that shows where the mouse is

On a normal Plot the crosshair is working very well see screenshot here But when my plot is embadded in the GUI aka not a seperate window it does not display it. one of the warnings that im getting for the code is "cursor" is not…
Joe_bart
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ImportError: cannot import name 'register_tortoise' from 'tortoise.contrib.pydantic'

I hope everyone are safe and fine. I am trying this code to make it work. I have a main.py file and models.py file where I have a Class User created in the models.py file and I am trying to import the User class from models.py file to main.py file.…
Sagabarnisa S
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In VSCode, prevent PyLance warning: Invalid character in identifier

After an update to VSCode's Python plugin, PyLance is causing trouble. def (f, *args): if f: f(*args) ... causes "Invalid character in identifier" How to disable these warnings? Maybe I need to create…
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why VScode does not recognize pynput mouse.position?

im beginner in python programming and i start learning it with visual studio IDE there something wrong with it when i use the below code to get mouse current position it will work fine but mouse.position is not in autocomplete list. from…
Deep Dreams
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How to use own Python Packages within the own packages? ModuleNotFoundError: No module named

I created some code using the following structure: ├── project | ├── .vscode | | └── settings.json | ├── packages | | ├── __init__.py | | ├── module_one.py | | └── module_two.py | └── main.py module_one content def…
Harry
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I am gettting Error in my output Python in Visual Studio

whenever I save a .py file, even if it's new, I get an error in my output window... I think is because of Pylance but I can use it without a problem. I am new in Python and I don't really know how to fix that. This is the message I get: """ User…
Julio
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Discord Bots: Detecting a message within another command

On my discord bot (python) I am trying to detect or rather to check a sent message within a command: if someone types the command $start the command should check in a while loop which messages are being sent after the $start command. If the sent…
Toilettenbrain
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Pylance not recognizing parts of libraries

i'm currently programming in python using VS code with the pylance extension, it's working pretty well except i can't import an entire library at once, i have to import the individual functions which is kind of annoying for learning purposes in the…
mast3r_waf1z
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Pylance reportUnknownMemberType even though variable type is known

I'm using Pylance on VSCode and I'm getting this reportUnknownMemberType warning/error for this variable, even though I can see that it knows the type. I'm pretty new to classes so if there's a better way to do this, please let me know. My aim is to…
Salazaja
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How to visualize original builtin.py file

I was curious about how are made some built-in functions of Python (like print(), input(), etc.) but when I select "Go to Definition" or "Go to Declaration" VSCode takes me to some Stub_files.pyi that don't make me able to visualize the code of the…
Seintian
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Unpacking tuple gives tuple size mismatch error

When typechecking tuple unpacking, I get pylance errors (basic setting) on this program. The idea is that a tuple can have 2 or 3 elements of a specific type. # pylance typechecking "basic" from typing import Tuple, Union TT =…
Emile
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Format arguments as string

I'm trying to pull in google service account details as an airflow variable and write this to file when running a KubernetesPodOperator. I'm currently trying to test this in pylance with a launch.json file as: { "version": "0.2.0", …
Sql_Pete_Belfast
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Filter method is behaving unexpectedly

I'm trying to introduce type hints into an existing codebase, but I'm running into an issue when I attempt to type my query. from sqlalchemy.orm.query import Query class DbContext: def __init__(self, db_host, db_port, db_name, db_user,…
Mister Epic
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