Python: Getting Started

What is Python?

Python is a high-level, general-purpose programming language famous for its clean, almost English-like syntax. It was designed so that reading code feels natural, which means you spend less time deciphering symbols and more time actually building things. Under the hood Python is interpreted, meaning your code is executed line-by-line at runtime rather than compiled into machine code beforehand.

Think of Python as a Swiss army knife: it works equally well for a quick ten-line automation script and a million-line machine-learning framework. That versatility is exactly why it has become the world's most popular programming language.

History of Python (Guido van Rossum)

In December 1989, a Dutch programmer named Guido van Rossum started working on a hobby project over the Christmas holidays. He wanted a language that sat between the low-level power of C and the friendly scripting style of the ABC language he had worked on previously. He named it Python, not after the snake, but after the BBC comedy series Monty Python's Flying Circus.

Python 1.0 shipped in 1994. Python 2.0 arrived in 2000, adding list comprehensions and garbage collection. Python 3.0 launched in 2008 with a deliberate break from backward compatibility to fix long-standing design mistakes. Python 2 reached end-of-life in 2020, and today everything new is written in Python 3.

Applications of Python

Python turns up everywhere, from NASA automation scripts to TikTok's recommendation engine. Below are the domains where Python genuinely shines.

Installing Python (Windows, macOS, Linux)

Before you can run any Python code locally, you need the Python interpreter on your machine. The official download is always at python.org/downloads. Always grab the latest stable Python 3 release.

Windows

Download the installer from python.org and run it. On the very first screen, tick the checkbox that says "Add Python to PATH", this is easy to miss and causes headaches later if skipped. Once installed, open Command Prompt and typepython --versionto confirm the install.

macOS

macOS ships with an older Python 2, so install Python 3 separately. The cleanest approach: install Homebrew first, then runbrew install python. Alternatively, download the macOS installer directly from python.org.

Linux

Most Linux distros already include Python 3. Update with your package manager:sudo apt install python3on Ubuntu/Debian orsudo dnf install python3on Fedora.

Installing VS Code for Python

Visual Studio Code is arguably the best free code editor for Python beginners. It is lightweight, opens instantly, and has an incredible Python extension that gives you auto-complete, error highlighting, and a built-in debugger in one package.

Installing PyCharm IDE

PyCharm, made by JetBrains, is a fully dedicated Python IDE. It is heavier than VS Code but includes smarter code completion, a built-in virtual environment manager, and first-class support for Django and scientific computing. The Community Edition is completely free.

Using Jupyter Notebook

Jupyter Notebook is different from a normal code editor, it runs in your browser and lets you mix live, executable code, formatted text (Markdown), and charts all in one document called a "notebook". Data scientists love it because you can experiment cell by cell without re-running the entire script every time.

Online Python Compilers

You do not always need a local install. Online compilers let you write and run Python straight in the browser, great for quick experiments, sharing code with friends, or learning on a machine where you can't install software.

Hello World Program

Every programmer's first program is "Hello, World!", a tradition that dates back to Brian Kernighan's 1978 C book. In Python, it is just one line. That simplicity is not an accident; Guido van Rossum designed the language so that the straightforward thing is always the easy thing.

Understanding the Python Interpreter

When you run a Python file, the Python interpreter reads your source code from top to bottom, line by line. It converts each line into bytecode, a simplified set of instructions, then executes that bytecode on the Python Virtual Machine (PVM). This all happens invisibly and instantly for small scripts.

Running Python Scripts (.py files)

A Python script is just a plain text file saved with the .py extension. You run it from your terminal by passing the filename to the Python interpreter. This is the most common way to run Python code in production.

Python Interactive Shell (REPL)

The Python REPL (Read-Evaluate-Print Loop) is an interactive shell where you type one line of Python and instantly see the result. You don't save a file or press any run button, just type and hit Enter. It is fantastic for experimenting, testing a quick idea, or learning how a specific function behaves.

Start it by typing python (Windows) or python3 (macOS/Linux) in your terminal. You'll see a prompt like >>>, that means Python is waiting for your input. Type exit() to quit.

Python 2 vs Python 3

If you search for Python tutorials online you may run into Python 2 examples , old blog posts, university slides, legacy codebases. Python 2 and Python 3 look similar but have real differences that will cause errors if you mix them up. The short answer: always use Python 3 for anything new. Python 2 has been officially dead since January 2020.

PEP 8 Style Guide Basics

PEP stands for Python Enhancement Proposal, numbered documents that describe changes, improvements, or conventions for Python. PEP 8 specifically is the official style guide. Following it makes your code consistent with virtually all professional Python code in the world, which means other developers (and future you) will find it infinitely easier to read.

You don't need to memorise every rule on day one. Fix one habit at a time and it quickly becomes second nature.

Quiz, Test Your Knowledge

Let's see how much you picked up. Answer the questions below, no pressure, you can retry as many times as you like.