Hey there! Since virtualenv is already set up on your Windows system, you just need to create a virtual environment first before activating it. Let’s walk through the process step by step:

Step 1: Open Terminal and Navigate to Your Project Folder #

Launch either Command Prompt (CMD) or PowerShell, then use the cd command to move to the directory where you want to set up your isolated environment. For example:

cd C:\Users\Dell PC\Documents\MyPythonProject

Step 2: Create a Virtual Environment #

Run this command to generate a new virtual environment (you can replace venv with any name you like, such as my_dev_env):

virtualenv venv

This will create a folder named venv (or your custom name) in your project directory, containing a standalone Python environment.

Step 3: Activate the Virtual Environment #

The activation command varies a bit based on which terminal you’re using:

• In Command Prompt (CMD):

  venv\Scripts\activate.bat
  

• In PowerShell:

  venv\Scripts\Activate.ps1
  

Fix PowerShell Script Execution Errors #

If PowerShell blocks the activation script with a "execution disabled" error, run this command first (press Y when prompted to confirm):

Set-ExecutionPolicy RemoteSigned -Scope CurrentUser

This lets your user account safely run local scripts without affecting system-wide settings.

Confirm Activation #

Once activated, you’ll see your virtual environment’s name in parentheses at the start of your terminal prompt (like (venv)), which means you’re now working in the isolated Python environment.

To Exit the Virtual Environment #

When you’re done with your work, just run this command to deactivate:

deactivate

内容的提问来源于stack exchange，提问作者Didi