Installing Python and Running Code🌱 Beginner

Setting up a Python environment involves installing the Python interpreter and mastering pip (the package installer) and Virtual Environments.

What is a Virtual Environment?

In Node.js, when you install packages, they go into a local node_modules folder inside your project. By default, Python does the opposite: it installs packages globally across your entire computer. A Virtual Environment (venv) is a tool that creates an isolated sandbox for a specific project so its libraries don't conflict with other projects.

Why are venvs Mandatory?

If Project A requires Django version 2, and Project B requires Django version 4, installing them globally will destroy one of the projects. Using a virtual environment guarantees that Project A and B have their own isolated, independent copies of Django.

How to Setup and Run

Open your terminal inside a new project folder:

# 1. Create a virtual environment named 'venv'
python -m venv venv

# 2. Activate the virtual environment (Mac/Linux)
source venv/bin/activate
# (On Windows Command Prompt: venv\Scripts\activate)

# 3. Install a third-party package safely into the sandbox
pip install requests

# 4. Save your dependencies to a file (equivalent to package.json)
pip freeze > requirements.txt