Python Introduction and Setup

What is Python?

Python is a high-level, interpreted programming language famous for its readable, English-like syntax. It is used everywhere: web back-ends, data science, machine learning, automation, scripting and education.

Why Python Is So Popular

• Readable: indentation replaces braces, so code reads like a story.
• Interpreted: run programs immediately without a compile step.
• Batteries included: a huge standard library ships with it.
• Huge ecosystem: Django, Flask, pandas, NumPy, TensorFlow.
• Beginner friendly: the fastest route from idea to running code.

Installing Python

Download from python.org and check Add Python to PATH during the Windows installer. On Ubuntu/Debian:

sudo apt update && sudo apt install -y python3 python3-pip
python3 --version

Your First Program

print("Hello, World!")

Save it as hello.py and run with:

python hello.py

Using the Interactive Shell

python
>>> 2 + 2
4
>>> exit()

Key Points

• Python uses indentation (4 spaces) instead of braces to group blocks.
• Run a file with python file.py; explore live with the REPL.
• PEP 8 defines the recommended code style.