README.md

Installing-Different-Versions-of-Python-and-Managing-Virtual-Environments

This guide provides a step-by-step process to install different versions of Python and manage them using virtual environments.

Steps

1. Add the Deadsnakes Repository

sudo add-apt-repository ppa:deadsnakes/ppa

2. Update Package Lists

sudo apt update

3. Install Python 3.9 (or other versions)

sudo apt install python3.9

4. Install the venv Package for Python 3.9

sudo apt install python3.9-venv

5. Make a (hidden) Folder for Virtual Environments

mkdir ~/.venvs

6. Create a New Virtual Environment my-venv-name with Python 3.9

• Note 1: You can change my-venv-name to your preferred name.
• Note 2: You can also specify Python versions other than 3.9; however, the latest version is not always the most supported one. Beware!

python3.9 -m venv ~/.venvs/my-venv-name

7. Activate the New Virtual Environment my-venv-name

source ~/.venvs/my-venv-name/bin/activate

8. Check the Python Version Inside the Virtual Environment

python -V

9. Check the Pip Version Inside the Virtual Environment

pip3 --version

10. Deactivate the Virtual Environment (After finish using the VENV)

deactivate

11. (Optional) Make the Virtual Environment as an IPython Kernel for Jupyter Notebook

• Active the environment, my-venv-name, again

source ~/.venvs/my-venv-name/bin/activate

• Install ipython and ipykernel

pip install ipython ipykernel

• Configure the IPython Kernel for Jupyter Notebook

python -m ipykernel install --user --name=my-venv-name --display-name "My First Customised Kernel"