Python 3 — Welcome & Your First Hello World

🐍 Python 3 🟢 Lesson 1 📅 July 2026

Welcome to Python! If you are learning your very first programming language, you chose the best one. Python is famous for its clean, English-like syntax, allowing you to write powerful programs in fewer lines of code compared to Java or C++. Let's kick off this boot camp by running your first Python program.

1 What is Python?

Python is a high-level, general-purpose, interpreted programming language created by Guido van Rossum in 1991. The name "Python" wasn't inspired by the snake; instead, Guido named it after his favorite comedy show, Monty Python's Flying Circus!

Unlike languages that require compilation (converting code to machine language before running), Python runs line-by-line using an interpreter. This makes writing and testing code extremely fast and beginner-friendly.

2 Your First Program: "Hello, World!"

In most programming languages, print programs require class wrappers, public voids, or imports. In Python, writing a message to the screen requires only a single line. Let's see the print command:

Python 3 — Hello World ▶ Run Code

print("Hello, World!")
print("Welcome to Our Compiler!")

The print() function is a built-in command that tells the computer to output whatever is placed inside the parentheses. The text must be surrounded by quotation marks (either single quotes ' or double quotes ") to show Python that it is text (a string).

3 How Python Runs Code

When you click ▶ Run Code, the compiler takes your code and runs it sequentially:

Step	What Happens	Result
1. Read	Interpreter reads the first line: `print("Hello, World!")`	Validates syntax
2. Execute	Translates it to byte code and executes the instruction	Displays "Hello, World!" in output
3. Advance	Moves to the next line: `print("Welcome...")`	Displays second line and finishes

⚠️ Common Beginner Mistakes:

Capitalization: Python is case-sensitive! Typing Print("Hello") with a capital "P" will result in a NameError because Python only recognizes the lowercase print.
Missing Quotes: Leaving out quotes, like print(Hello World), causes a SyntaxError because Python thinks "Hello" and "World" are variable names.

4 Coding Challenge

Let's write a simple program. Open the compiler, clean out the editor, and write a program that displays your name, a fun fact about you, and what programming language you want to learn next. Execute it to see the output.