Python Basics

Installing Python and Setting Up Your Environment

Download and install Python on Windows, macOS, or Linux, and write your very first Python program.

Your First Python Program

Learn how to write and run a Python script file, understand what print() does, and add comments to your code.

Variables and Assignment

Learn what variables are, how to create them, and how to use them to store and reuse information in your programs.

Data Types: int, float, str, bool

Learn about the four most common Python data types — integers, floats, strings, and booleans — and how to check what type a value is.

String Operations and Methods

Learn how to slice strings, check their length, search for text, change case, and use the most useful string methods.

Getting User Input

Learn how to use the input() function to ask users for information and use their answers in your programs.

if / elif / else Statements

Learn how to make decisions in Python using if, elif, and else to run different code depending on conditions.

for Loops

Learn how to repeat actions automatically using for loops, range(), and how to loop over lists and strings.

while Loops

Learn how to use while loops to repeat code as long as a condition is true, and how to control loops with break and continue.

Functions

Learn how to write reusable functions, pass arguments, return values, and organize your code into logical building blocks.

Lists

Learn how to store multiple values in a list, access and modify elements, loop over lists, and use the most common list methods.

Dictionaries

Learn how to store and look up data using key-value pairs with Python dictionaries.

Reading and Writing Files

Learn how to save data to text files and read it back, so your programs can remember information between runs.

Handling Errors

Learn how to use try/except to catch errors gracefully, so your programs keep running instead of crashing.

Putting It All Together — Build a Simple CLI App

Apply everything you have learned to build a complete command-line contact book application with file storage.