Programming

Install Python 3.9 and Set Up Virtual Environment on Ubuntu

Step 1: Update and Upgrade System

sudo apt update && sudo apt upgrade -y

Step 2: Install Required Dependencies

sudo apt install software-properties-common -y

Step 3: Add Deadsnakes PPA (For Latest Python Versions)

sudo add-apt-repository ppa:deadsnakes/ppa -y
sudo apt update

Step 4: Install Python 3.9

sudo apt install python3.9 python3.9-venv python3.9-dev -y

Step 5: Verify Python Installation

python3.9 --version

Step 6: Create a Virtual Environment

Navigate to Your Project Directory

mkdir myproject && cd myproject

Create Virtual Environment

python3.9 -m venv venv

Step 7: Activate Virtual Environment

For Bash, Zsh:

source venv/bin/activate

For Fish Shell:

source venv/bin/activate.fish

For Windows (if using WSL):

source venv/bin/activate

Step 8: Verify Virtual Environment

python --version  # Should show Python 3.9.x

Step 9: Install Required Python Packages

Example:

pip install --upgrade pip
pip install numpy pandas flask

Step 10: Deactivate Virtual Environment

To exit the virtual environment:

deactivate

Notes

• Always activate the virtual environment before installing packages.
• Use deactivate to exit the virtual environment when done.

Enjoy your Python 3.9 environment on Ubuntu! 🚀