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Python

From Python basics to machine learning.

All (32) Beginner (14) Intermediate (10) Advanced (8)

🌱 Beginner 14 lessons

Start here. No experience needed.

Lesson 1

What Is Python and Why Learn It?

Find out what a programming language is, what Python is used for and why it is great for beginners, then run y...

Beginner 9 min

Lesson 2

Installing Python and VS Code, and Running Your First File

Install Python and VS Code on Windows, Mac or Linux, check that they work, try the interactive shell and run y...

Beginner 9 min

Lesson 3

Your First Program: print() and Comments

Write your first Python programs with print(): show text and numbers, control spacing with sep and end, use es...

Beginner 8 min

Lesson 4

Variables and Data Types: Storing Information

Learn to store information in Python variables, name them with snake_case, change their values, and use the ma...

Beginner 9 min

Lesson 5

Numbers and Math: Bills, Discounts and Percentages

Learn Python arithmetic, floor division, remainders, powers, rounding and the math module, then build a restau...

Beginner 8 min

Lesson 6

Strings: Working with Text and f-strings

Learn to create, slice, clean and search text in Python with string methods, and build neat messages with f-st...

Beginner 10 min

Lesson 7

Taking Input: input() and Type Conversion

Ask the user questions with input(), convert the answers with int(), float(), str() and bool(), avoid the clas...

Beginner 9 min

Lesson 8

Conditions: if, elif and else

Teach your Python programs to make decisions with if, elif and else, comparison operators and and, or, not. Yo...

Beginner 11 min

Lesson 9

Loops: for, while and range()

Repeat work with Python for and while loops, count with range(), add up totals and control loops with break an...

Beginner 10 min

Lesson 10

Lists: Storing Many Items in Order

Store many values in one Python list, read them by index and slice, add and remove items, sort them and loop w...

Beginner 11 min

Lesson 11

Tuples and Sets: Fixed Data and Unique Items

Store fixed data in Python tuples, unpack them into variables, and use sets to remove duplicates and compare g...

Beginner 10 min

Lesson 12

Dictionaries: Storing Data with Keys

Store data as key-value pairs in Python dictionaries, read values safely with get(), loop with items() and cou...

Beginner 10 min

Lesson 13

Functions: Reusable Blocks of Code

Write your own Python functions with def, pass arguments, return results, use default and keyword arguments an...

Beginner 11 min

Lesson 14

Project: Build a Number Guessing Game

Build a complete number guessing game in Python step by step, with random numbers, hints, an attempt limit, in...

Beginner 16 min 🔨 Project

⚙️ Intermediate 10 lessons

You know the basics. Build real skills.

Lesson 15

More on Functions: *args, **kwargs, lambda and Scope

Write flexible Python functions with keyword arguments, *args, **kwargs and keyword-only parameters, sort data...

Intermediate 12 min

Lesson 16

Comprehensions: Lists, Dicts and Sets in One Line

Build new lists, dictionaries and sets in one readable line with Python comprehensions, filter with if, choose...

Intermediate 12 min

Lesson 17

Modules and Packages: import, the Standard Library and pip

Use import, from ... import and as, explore math, random, datetime, statistics and string, write your own modu...

Intermediate 11 min

Lesson 18

Working with Files: Reading and Writing Text

Read and write text files in Python with open() and with blocks, choose the right mode (r, w, a), loop over li...

Intermediate 11 min

Lesson 19

Error Handling: try, except, else and finally

Handle Python exceptions with try, except, else and finally, read a traceback, raise your own errors, create a...

Intermediate 12 min

Lesson 20

Dates and Time with the datetime Module

Create, compare and format dates and times with Python's datetime module. Count the days left for Diwali, read...

Intermediate 11 min

Lesson 21

JSON and CSV: Saving and Sharing Data

Save and share data with Python's json and csv modules. Read a marks spreadsheet, calculate averages and conve...

Intermediate 10 min

Lesson 22

Classes and Objects: Modelling Real Things

Learn object-oriented programming in Python with classes, objects, __init__, self and methods. Model train tic...

Intermediate 12 min

Lesson 23

Inheritance and Special Methods

Reuse code with inheritance and super(), override methods, and make your objects work with print, len, ==, sor...

Intermediate 13 min

Lesson 24

Regular Expressions in Python: Finding Patterns in Text

Use Python's re module to find, check and replace patterns in text. Validate PIN codes, mobile numbers, PAN an...

Intermediate 13 min

🚀 Advanced 8 lessons

Go deeper, write professional code and build projects.

Lesson 25

Iterators and Generators: Handling Data One Item at a Time

Learn how Python loops work inside, write your own generators with yield, save memory with generator expressio...

Advanced 13 min

Lesson 26

Decorators: Adding Features to Functions

Learn how Python decorators wrap extra features around a function, like gift paper around a gift. Write your o...

Advanced 13 min

Lesson 27

Virtual Environments and pip: Managing Project Libraries

Give every Python project its own shelf of libraries. Create and activate a virtual environment on Windows, Ma...

Advanced 12 min

Lesson 28

Working with Web APIs: requests and JSON

Call web APIs from Python with the requests library: GET and POST, query parameters, status codes, timeouts an...

Advanced 15 min

Lesson 29

Testing Your Code: assert, unittest and pytest

Check your Python code automatically, like a quality checker at a biscuit factory. Write testable functions, u...

Advanced 14 min

Lesson 30

Project: Build a Student Marks Report Generator

Build a Python program that reads a class marks CSV and calculates totals, percentages, grades, ranks with tie...

Advanced 25 min 🔨 Project

Lesson 31

Project: Organise Messy Folders Automatically

Build a Python program that sorts a messy Downloads folder into Documents, Images, Videos, Archives, Code and ...

Advanced 25 min 🔨 Project

Lesson 32

Project: Build a Command-Line Expense Tracker

Build a menu-driven expense tracker in Python that validates amounts and dates, saves to JSON, shows monthly a...

Advanced 33 min 🔨 Project