This is a step-by-step guide to learn Dependency Injection (DI) in Python. Each section has working code examples that you can run and experiment with.

1. Why Dependency Injection?

   • Problems with tightly coupled code
   • How DI makes code better
   • Simple database example

2. Basic Patterns

   • What is Dependency Injection?
   • Real example with notification system
   • Different ways to inject dependencies

3. IoC Principles

   • What is Inversion of Control?
   • Event-based systems
   • How frameworks use IoC

4. DI Container

   • What is a DI container?
   • How to register services
   • How to resolve dependencies

5. Web Application

   • Real example using Litestar
   • How to structure a web app with DI
   • How to test code with DI

1. Start from section 1 and move forward
2. Each folder has:
   • Code examples you can run
   • README explaining the concepts
   • Problems and solutions

• Python 3.8 or newer
• Basic Python knowledge
• For web app example: pip install litestar ...

Note: Check out my_brain_dump.py - my first attempt at building a DI container. It might be weird, but "it's nice" 😄