Lesson 5: Your First Lines of Python

Python is the undisputed language of Artificial Intelligence.

Why Python? It is simple to read, incredibly powerful, and has a massive ecosystem of AI tools. To the right, you'll see a fully functional Python environment running directly in your browser. No installation required.

Your First Command: Print

The most basic command in Python is print(). It simply displays whatever you put inside the parentheses on the screen.

print("Hello, AI World!")

Try it out! Type the exact command above into the code editor on the right and hit the Run Code button.

Variables: Storing Data

In AI, we deal with massive amounts of data. We store this data in variables. Think of a variable as a labeled box that holds information.

name = "Zero2AI"
model_accuracy = 0.95
print(name)

Basic Math

At its core, Machine Learning is just a lot of math happening very quickly. Python makes this easy:

Addition: 5 + 3
Subtraction: 10 - 2
Multiplication: 4 * 5
Division: 20 / 4
Exponents: 3 ** 2 (This is 3 squared)

Coding Challenge

Imagine an AI model was tested on 1000 images and predicted 847 of them correctly.

Create a variable called correct and set it to 847.
Create a variable called total and set it to 1000.
Calculate the accuracy as a percentage and print() the result.

Hint: Divide correct by total, then multiply by 100.