Python First Steps
Run your first program and learn how Python prints text.
Python Programming
Courses that take you from your first print() to functions, errors, and modules. Every course ends with a coding exercise you run in the browser.
Variables and Data Types
Store values in variables and tell numbers, text and booleans apart.
Operators and Expressions
Calculate with arithmetic, comparison and logical operators.
Conditions and Decisions
Make programs choose between actions with if, elif and else.
Loops
Repeat work with for and while loops.
Lists and Tuples
Keep ordered collections of values and work with their items.
Dictionaries and Sets
Look values up by key and remove duplicates with sets.
Functions
Package reusable logic with parameters and return values.
Strings and Text Processing
Slice, search and transform text.
Errors, Exceptions and Modules
Handle problems gracefully and reuse code from modules.
List Comprehensions
Build a new list from an existing one in a single readable line.
Tuples and Unpacking
Return several values at once and unpack them into separate names.
Nested Data Structures
Read and update lists of dictionaries and dictionaries of lists.
Advanced String Formatting
Control decimal places, padding and alignment inside f-strings.
Default and Keyword Arguments
Give parameters sensible defaults and call functions by name.
Variable Arguments: *args and **kwargs
Write functions that accept any number of positional or named arguments.
Lambda Functions and map/filter
Write short, throwaway functions and pass them to other functions.
Recursion
Solve problems where a function calls itself on a smaller piece of the problem.
Classes and Objects
Group related data and behaviour together with your own classes.
Inheritance and Polymorphism
Reuse a class in another class and let related classes behave differently.
Special (Dunder) Methods
Make your own classes print nicely and support == and other operators.
Iterators and Generators
Produce a sequence of values one at a time without storing them all in memory.
Decorators
Wrap a function to add behaviour before or after it runs, without changing its code.
Context Managers and with
Guarantee setup and cleanup code runs, even if something goes wrong in between.
Working with JSON
Convert Python data to JSON text and back with the json module.
Regular Expressions Basics
Search for and extract patterns in text with the re module.
Working with Dates and Times
Create, format and compare dates with the datetime module.
Simulating File Input and Output
Read and write text like a file, using io.StringIO in the browser sandbox.
Testing Your Code
Check that your functions behave correctly with assert statements.
Sorting and Searching Algorithms
Understand how basic sorting and searching algorithms work under the hood.
Reading and Writing Files
Open, read, write and safely close text files.
Inheritance and Polymorphism
Reuse and specialise classes through inheritance.
Iterators and Generators
Produce values one at a time without storing them all in memory.
Mini Project: Word Counter
Combine strings, dictionaries and loops into one small program.
Set Operations
Combine, compare and filter collections using union, intersection and difference.
Unpacking and Multiple Assignment
Assign several values at once and unpack sequences cleanly.
Lambda Functions and Higher-Order Functions
Write short anonymous functions and pass functions as arguments.
Debugging and Reading Tracebacks
Read a Python error message and find the bug it points to.
Capstone Project: Simple Library Catalog
Build a small program that models books using classes, lists and dictionaries together.
Modules, Packages and Imports
Organise larger programs into reusable files and folders.
Formatting Output with f-strings
Build clean, well-formatted output lines from variables and expressions.
Boolean Logic and Nested Conditions
Combine conditions with and, or and not, and nest decisions clearly.
While Loops and Loop Control
Repeat until a condition changes and control loops with break and continue.
String Methods in Depth
Clean, search, split and rebuild text with the most useful string methods.
List Methods and Sorting
Add, remove and reorder list items and sort by any rule.
Function Arguments: Defaults, *args, **kwargs
Write flexible functions that accept optional, keyword and variable arguments.
Lambda, map and filter
Write small anonymous functions and apply them to whole collections.
The math and statistics Modules
Use the standard library to do maths and summarise data.
Counter and defaultdict
Count items and group data quickly with the collections module.
Classes and Objects
Model real things with classes, attributes and methods.
Type Hints and Dataclasses
Document your code with type hints and cut boilerplate with dataclasses.
Searching and Sorting Algorithms
Implement linear search, binary search and a simple sort by hand.
Mini Project: Word Frequency Analyzer
Combine strings, loops, dictionaries and sorting into one small analysis program.