Install the Pylance Extension in Visual Studio Code – Complete Beginner's Guide

If you have already installed the Python Extension, the next step is to install the Pylance Extension. Pylance is one of the most important extensions for Python development in Visual Studio Code. It provides faster code completion, intelligent suggestions, advanced type checking, and accurate error detection.

Although the Python Extension adds Python support to Visual Studio Code, Pylance enhances your coding experience by making the editor smarter and more responsive. Throughout this FastAPI course, Pylance will help you write cleaner, more reliable, and error-free Python code.

In this guide, you'll learn what Pylance is, why it's important, how to install it, and how to verify that it's working correctly.

What is Pylance?

Pylance is the official Python language server developed by Microsoft for Visual Studio Code. It uses the Pyright static type checker to provide advanced language features for Python developers.

Pylance helps VS Code understand your Python code better, allowing it to provide accurate code suggestions, highlight errors before running your program, and improve navigation throughout your project.

Why Do We Need Pylance?

Pylance significantly improves the Python development experience.

Some of its key features include:

Fast IntelliSense (smart code completion)
Auto-import suggestions
Advanced type checking
Real-time error detection
Better code navigation
Function and variable documentation
Rename symbols safely
Find references across the project
Improved performance for large projects
Better support for FastAPI development

These features help you write code faster while reducing mistakes.

Prerequisites

Before installing Pylance, make sure you have:

Windows 10 or Windows 11
Visual Studio Code installed
Python installed
Python Extension installed
Internet connection

If you have not installed the Python Extension yet, complete that lesson before continuing.

Download the Pylance Extension

Pylance is available for free from the official Visual Studio Code Marketplace.

Official Marketplace Page

https://marketplace.visualstudio.com/items?itemName=ms-python.vscode-pylance

Method 1: Install from Visual Studio Code (Recommended)

Step 1

Open Visual Studio Code.

Step 2

Open the Extensions panel by clicking the Extensions icon on the left sidebar.

Or press:

code

Ctrl + Shift + X

Step 3

In the search box, type:

code

Pylance

Choose the extension published by:

code

Microsoft

The extension name should be:

code

Pylance

Be sure to install the official extension published by Microsoft.

Step 4

Click the Install button.

VS Code will download and install the extension automatically.

Step 5

After installation, VS Code may ask you to reload the editor.

Click:

code

Reload

or restart Visual Studio Code.

Method 2: Install from the Marketplace Website

You can also install Pylance directly from the official Marketplace website.

Official Marketplace Link:

https://marketplace.visualstudio.com/items?itemName=ms-python.vscode-pylance

Click Install, and the website will launch Visual Studio Code and begin the installation.

Verify the Installation

To verify that Pylance has been installed successfully:

Open the Extensions panel.
Search for Pylance.
If you see the status Installed, the extension has been installed successfully.

Enable Pylance as the Python Language Server

In most cases, Pylance is enabled automatically.

To verify:

Open Command Palette

code

Ctrl + Shift + P

Search for:

code

Python: Select Language Server

If available, select:

code

Pylance

Note: In recent versions of the Python Extension, Pylance is enabled automatically, and this option may no longer appear because it is the default language server.

Test Pylance

Create a new Python file named:

code

test.py

Type the following code:

code

name = "FastAPI"

print(name.upper())

As you type:

Code suggestions should appear automatically.
Method names like upper() should be suggested.
Hovering over functions will display documentation.
Errors will be highlighted instantly if you make a mistake.

This confirms that Pylance is working correctly.

Features You'll Use During This Course

Throughout this FastAPI course, Pylance will help you with:

Smart code completion
Type checking
Import suggestions
Function parameter hints
Documentation on hover
Error highlighting
Code navigation
Symbol search
Refactoring support

These features make development faster and reduce common programming errors.

Common Installation Problems

Pylance Does Not Appear

Check your internet connection and refresh the Extensions panel.

Unable to Install

Update Visual Studio Code to the latest version and try again.

No IntelliSense

Verify that:

The Python Extension is installed.
Pylance is installed.
A Python interpreter is selected.
The file has a .py extension.

Code Suggestions Are Slow

Restart VS Code.

If the problem continues, update both the Python Extension and Pylance to the latest versions.

Best Practices

Always use the official Microsoft Pylance Extension.
Keep Pylance updated.
Use the latest version of Visual Studio Code.
Select the correct Python interpreter for every project.
Avoid installing multiple Python language servers unless necessary.

Summary

Congratulations! You have successfully installed the Pylance Extension.

Your Visual Studio Code environment now provides intelligent code completion, advanced type checking, and real-time error detection, making Python and FastAPI development much easier.

In the next lesson, we will install the Black Formatter Extension to automatically format Python code according to professional coding standards.

Frequently Asked Questions (FAQs)

Is Pylance free?

Yes. Pylance is completely free and developed by Microsoft.

Do I need both the Python Extension and Pylance?

Yes. The Python Extension provides Python support, while Pylance enhances it with advanced language features.

Is Pylance required for FastAPI?

It is not mandatory, but it is highly recommended because it improves productivity and helps detect errors early.

Does Pylance make my code run faster?

No. Pylance improves the editing experience, not the execution speed of your Python programs.

Official Download Links

Pylance Extension

https://marketplace.visualstudio.com/items?itemName=ms-python.vscode-pylance

Python Extension

https://marketplace.visualstudio.com/items?itemName=ms-python.python

Visual Studio Code

https://code.visualstudio.com/