Python Introduction

Python is a high-level, general-purpose, interpreted programming language created by Guido van Rossum and first released in 1991. It emphasises code readability through significant indentation, and ships with a massive standard library — letting you accomplish complex tasks (web servers, data analysis, automation, ML, scripting) in a fraction of the code other languages require.

Python is dynamically typed (you don't declare types), garbage-collected (memory is freed automatically), and supports multiple paradigms — procedural, object-oriented and functional. As of 2026, it is the most-loved language on Stack Overflow and the de facto language for data science, AI/ML, scripting, and beginner programming education.

• Beginner-friendly — reads like English; you can write a useful program on day one.
• Massive ecosystem — 500,000+ packages on PyPI for every domain (web, data, AI, automation).
• Highest demand in 2026 — top language in AI/ML (PyTorch, TensorFlow), data science (Pandas, NumPy), and back-end web (Django, FastAPI).
• Cross-platform — the exact same code runs on Windows, macOS, Linux and even Raspberry Pi.
• Career-ready — average Python dev salary in India is ₹8-12 LPA; senior data scientists clear ₹25-40 LPA.
• Excellent for prototyping — go from idea to working demo in hours, not days.

• Web applications — Instagram, Pinterest, Reddit, YouTube and Spotify all run heavy Python back-ends.
• Data science & analytics — Pandas + NumPy + Matplotlib power most analyst dashboards.
• AI / Machine Learning — PyTorch, TensorFlow, scikit-learn, Hugging Face: every major ML framework speaks Python.
• Automation & scripts — file batchers, scrapers, deployment scripts, system admin tools.
• APIs & micro-services — FastAPI / Flask / Django REST.
• Game logic, IoT, robotics, fintech, security tooling — Python sits in all of them.

python Run in compiler
# A complete Python program — no main(), no headers, no boilerplate.
print("Hello, World!")
print("Welcome to Codekilla!")

Hello, World!
Welcome to Codekilla!

• Python is interpreted, dynamically typed, and garbage-collected.
• It powers 90 % of modern AI/ML, much of data science and a huge slice of web back-ends.
• A Python 'Hello, World!' is one line — no boilerplate.
• Indentation defines blocks instead of { } — same code, far less noise.
• Always use Python 3 — Python 2 reached end-of-life in January 2020.

1. Write a Python program that prints your name and age on two separate lines.
2. Read two numbers from input(), add them, and print the sum.
3. Bookmark https://docs.python.org/3/tutorial/ — the single best free resource on Earth.

• Names communicate intent — weekly_revenue is documentation; wr is a riddle.
• When you can't predict an output, run it and see. Surprises are how you learn.
• Use the Codekilla online compiler to experiment without leaving the lesson page.