Python Intermediate

A self-paced course for learners who know Python basics and want to write code that is clearer, easier to test, and ready for larger applications.

The course uses simple language first and then explains the engineering details. A school student can follow the examples in order, while a working developer can study the design notes, failure cases, and trade-offs.

Open the course website

Before you begin

You should be able to write a small Python program using variables, conditions, loops, strings, collections, functions, files, exceptions, and modules. You do not need to be an expert.

If several words in that sentence are unfamiliar, complete Python Basic first. Intermediate lessons deliberately build on those foundations.

Start here

1. Read the Learning Guide.
2. Complete Setup, including the readiness check.
3. Follow the lessons in order using the Course Map.
4. Type and change the examples instead of only reading them.
5. Solve all ten practice problems in each lesson.
6. Open one hint only after making a real attempt.
7. Complete the projects and final assessment.

Complete course path

Stage	Open
Course orientation	Learning Guide
Installation and readiness	Setup
Chapter 1	Pythonic Python
Chapter 2	Advanced Functions
Chapter 3	Iterators and Generators
Chapter 4	Decorators and Context Managers
Chapter 5	Object-Oriented Python
Chapter 6	Dataclasses and the Data Model
Chapter 7	Modules, Packages, and Environments
Chapter 8	Files and Serialization
Chapter 9	Errors, Logging, and Testing
Chapter 10	Regular Expressions
Chapter 11	APIs and HTTP
Chapter 12	SQLite and Databases
Chapter 13	Command-Line Applications
Chapter 14	Concurrency
Final practice	Projects · Interview Problems · Final Assessment

What every lesson contains

• A simple mental picture before technical words
• Complete examples with explanations and expected behavior
• Important Python rules, common mistakes, and production cautions
• Bug Hunter exercises for learning to debug calmly
• Ten on-page practice problems
• Numbered hints and solution ideas, collapsed by default on the website
• A homework task and a checkpoint

What you will build

• Data-processing pipelines using generators
• Reusable decorators and context managers
• Tested services with replaceable dependencies
• Safe JSON, CSV, API, and SQLite programs
• A command-line application with a clean architecture
• A measured concurrent file processor

If you feel stuck

Use this order:

1. Say what the program should do in one sentence.
2. Run the smallest example from the lesson.
3. Read the final line of the error and find its line number.
4. Print or inspect the values just before the failure.
5. Open one matching hint.
6. Ask for help with the code, input, full error, and what you already tried.

Repository layout

• 00-setup/ — installation, virtual environment, and readiness check
• Numbered folders — lessons in learning order
• projects/ — guided applications that combine lessons
• interview-problems/ — mixed design and coding practice
• quizzes/ — final assessment and review criteria
• problem-solving/ — optional future printable archives; main practice stays in lessons