Python virtual environments are essential for managing dependencies and avoiding conflicts between projects. This guide will walk you through the process of creating and activating a virtual environment in Python.

Step 1: Navigate to Your Project Directory

Open your terminal and navigate to the directory where you want to set up your Python virtual environment. You can do this using the cd command:

cd /path/to/your/project

Step 2: Create the Virtual Environment

In the terminal, enter the following command to create a virtual environment. The name .venv is commonly used, but you can choose any name you prefer:

python3 -m venv .venv

Step 3: Define Your Project Dependencies

Create a text file named requirements.txt in your project directory. In this file, list the Python libraries you want to install for your project. For example:

flask
requests
numpy

Step 4: Activate the Virtual Environment

To start using the virtual environment, you need to activate it. Use the following command based on your operating system:

For Windows:

.\.venv\Scripts\activate

For macOS/Linux:

source .venv/bin/activate

Once activated, your terminal prompt will change to indicate that you are now working within the virtual environment.

Step 5: Upgrade pip

It’s a good practice to ensure that pip is up-to-date. Run the following command to upgrade pip:

.venv\Scripts\python.exe -m pip install --upgrade pip

Step 6: Install Project Dependencies

Finally, install the Python libraries listed in your requirements.txt file by running:

pip install -r requirements.txt