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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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What is the pylance subscript error trying to tell me about my dictionary?

I have the following piece of code: for table in list(my_dict.keys()): if table in my_other_dict: for file in my_dict[table]: if file in my_other_dict[table]: my_dict[table].remove(file) if not…
Itération 122442
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Linter complaining when instance variable of subclass is another subclass instance, which can have different instance variables

This is a bit confusing, and I tried to explain it in simple English but it's hard to follow. Instead, I have written the following toy code to illustrate the problem. This code runs fine and prints the expected output, however my linter complains…
KOB
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Import "requests" could not be resolved from sourcePylancereportMissingModuleSource (module) requests

I am having an error while importing the library request: Import "requests" could not be resolved from sourcePylancereportMissingModuleSource (module) requests In addition, flask, flask_restful and pandas are not working too, however, random works…
tal moshel
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Import "flask_mysqldb" could not be resolved Pylance(reportMissingImports)

Uhh, well I get this error Import "flask_mysqldb" could not be resolved Pylance(reportMissingImports) And I don't really know if I'm missing something because when I try to install stuff it says "requirement already fulfilled" and I'm panicking…
Paty Pizá
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Visual Studio doesn't show help pop up with DataFrame from awswrangler

I am using VS Code with Microsoft Python extension. If I create a Pandas dataframe and write the name of the variable VS Code popups all kinds of help text. However, if I have a variable made using wr.athena.read_sql_query, I don't get any help text…
user3914505
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How do I fix "x" is not accessed Pylance

It says "x" is not accessed Pylance But I don't know why it used to work until now. If you can please help. troll3= ["troll" , "ulikemen" , "someone-is-in-my-house" , ";/","amogsus"] …
Scripter
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Visual studio code reports docopt import error while there are no problems in bash terminal

Just installed extension ms-python.python Visual studio code reports in regard of my code in main.py Import "docopt" could not be resolved from source { "resource": "/home/XXXXXXXXX/main.py", "owner":…
renameduser32
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import "unittest2" could not be resolved Pylance

I'm getting this error in my Python code for raspberry pi. import os import subprocess import sys import warnings import time from threading import Timer import RPi.GPIO as GPIO if sys.version[:3] == '2.6': import unittest2 as unittest else: …
Dev Raj
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Intellisense not recognizing variables returned by sklearn as array type

(my environment is vs code using pylance) For example, arrays returned from train_test_split() or LinearRegression.predict() are not recognized as an array and do not offer any autocomplete suggestions. In google colab and spyder after typing…
Aaron Biddle
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Is there a way to mark a python function as incomplete / unimplemented in VSCode / pylance?

I'm relatively new to python, using VSCode for python development. As far as I can tell VSCode is using an extension called "pylance" to handle python support features, such as detecting errors in code as you write. In the last language I spent time…
Ryan Hoffman
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Typing an optional named argument in overriden method in derived class

At runtime, the following code is perfectly valid: class Base(): @abstractmethod def get(self, arg: str, **kwargs: Any): pass class Derived(Base): def get(self, arg: str, optional_arg: bool = False, **kwargs: Any): …
stav
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Can't find the error on "Expected ")" Pylance [16,9]

What does the following error mean? Unindent does not match previous indent [6,3] Can't find the error on "Expected ")" Pylance [16,9]. Import "Numpy" could not be resolved
Titan
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Typing generic state functions in Python

I haven't been able to make either pylance or mypy happy with typing a generic state function. If I hardcode the state machine (not using a generic base class), I get no errors. In my actual implementation, the generic class is not also an abstract…
Joe Lapp
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Import "tensorflow.math" could not be resolved

I am using Jupyter Notebooks on VSCode to create a U-Net. Here is a quick snippet of my code that generates the error: # PREPARE U-NET MODEL from tensorflow.keras import Input, Model from tensorflow.keras.backend import clear_session from…
Mahyar Mirrashed
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Importing Issues in Visual Studio Code

In VS code, I am getting these Problems: Import "flask" could not be resolved from source Pylance it's this same problem for "googleapiclient.discovery, google_auth_oauthlib.flow, google.auth.transport.requests, and oauth2client.service_account. At…
sanminchui
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