Python

Hello, Python

Run your first Python program and learn how print works. No installation needed.

6 minFree preview

Variables

Give names to values so you can reuse and change them.

6 minFree preview

Data types

Integers, floats, strings and booleans, and how to convert between them.

7 min Account

Making decisions with if

Run code only when a condition is true, using if, elif and else.

7 min Account

Loops

Repeat actions with for and while, and use range to count.

8 min Account

Functions

Name and reuse blocks of code with parameters, default values and return.

8 min Account

Lists, dicts and sets

Python's built-in collections: ordered lists, key-value dictionaries and unique sets.

9 min Account

File handling

Read and write text files safely with open and the with statement.

8 min Account

Object-oriented programming

Classes, objects, methods, __init__ and inheritance: model real things in code.

10 min Account

Error handling

try, except, else, finally and raise: handle problems gracefully and raise your own.

8 min Account

Modules and packages

Import code from the standard library and from your own files, and organise projects.

9 min Account

Virtual environments

Isolate each project's dependencies with venv and pip, and record them in requirements.txt.

8 min Account