Python Introduction

What Is Python?

Python is a high-level, interpreted programming language known for readable syntax. It is used for web development, data science, automation, scripting, AI, and general-purpose software.

Pipeline:
  source (.py) → interpreter (CPython) → run

Blocks:   indentation (usually 4 spaces)
Output:   print("Hello")
Packages: pip install name

First released in 1991, Python emphasizes simplicity and a large library ecosystem on PyPI. This page is the gateway to the Python tutorials on CodeToFun.

Why Use Python?

Guido van Rossum created Python in the late 1980s and released it in 1991 at CWI in the Netherlands. The name comes from Monty Python—not the snake.

Key milestones

How a Python Program Runs

The common implementation is CPython (mostly written in C). It reads your .py file, compiles it to bytecode, and runs it.

Cheat sheet — building blocks

What Does a Python Program Look Like?

A minimal script prints a line. No class wrapper or semicolons required:

print("Hello, World!")

Keep indentation consistent. Mixing tabs and spaces is a common beginner error.

Python vs Java

If you know Java, map the ideas like this:

Same idea, two styles

Print a greeting:

public class HelloWorld {
    public static void main(String[] args) {
        System.out.println("Hello, World!");
    }
}

print("Hello, World!")

When to choose which

Install and Run Python

Download Python 3 from python.org, save demo.py, then run it from a terminal.

python --version
python demo.py

Hello, World!

How It Works

1. Check install. python --version (or python3 --version) confirms Python 3 is available.

2. Run the file. python demo.py starts the interpreter on your script.

3. Print. print() writes Hello, World! to the terminal.

Use pip install for packages and python -m venv .venv for an isolated environment. Next, practice text handling with Python string methods.

Where Is Python Used?

Common workloads where Python’s ecosystem fits well:

Key Takeaways