Introduction to Python

Python is a high-level, interpreted programming language built around readable syntax. There's no compile step, no manual memory management, and the code you write reads close to plain English — which is exactly why it's usually the first language people learn.

"Interpreted" means your code runs directly, line by line, without a separate compile step first (unlike Java or C++, where you compile before you run). That makes the feedback loop while learning much faster: write a line, run it, see what happens.

What Python is actually used for

• Scripting and automation — small programs that do one job well, like renaming a batch of files or scraping a webpage
• Data science and machine learning — most of the field runs on Python, via libraries like pandas, NumPy, and PyTorch
• Web backends — frameworks like Django and Flask power a large share of the web's server-side code
• Teaching — it's the default first language in most university intro courses, precisely because the syntax gets out of the way

A quick preview

Here's a single line of real Python, executed for real on this page's own compiler — not a mockup:

print("Hello from Python!")

Hello from Python!

That's the whole program. No imports, no boilerplate, no semicolons. The next lesson walks through exactly what's happening in that line, and has you write your own version.