📦 Module 13: Modules & Packages

As your Python projects grow, you need to organize code into reusable, maintainable pieces. This module teaches you how Python's module and package system works.

In Python: - A module is a single .py file containing definitions - A package is a directory of modules with an __init__.py - Virtual environments isolate project dependencies - Dependency management tracks what packages your project needs

Estimated Time: 6-8 hours Prerequisites: Modules 01-05 Level: ⭐⭐⭐ Intermediate

---

📚 Topics Covered

#	Topic	Description	Key Concepts
01	Imports	How Python finds and loads modules	import, from, as, sys.path
02	Creating Modules	Writing reusable modules	__name__, __all__, module design
03	Packages	Organizing modules into packages	__init__.py, subpackages, relative imports
04	Virtual Environments	Isolating project dependencies	venv, activation, isolation
05	Dependency Management	Managing external packages	pip, requirements.txt, pyproject.toml

---

🎯 Learning Goals

By the end of this module, you should be able to:

• Understand the import system and how Python finds modules.
• Create your own reusable modules with clean APIs.
• Structure larger projects using packages.
• Set up and use virtual environments for project isolation.
• Manage dependencies effectively with pip and requirements files.

---

📂 Module Structure

13_modules_packages/
├── README.md
├── 01_imports/
│   ├── README.md
│   ├── examples.py
│   ├── exercises.py
│   └── quiz.md
├── 02_creating_modules/
│   ├── README.md
│   ├── examples.py
│   ├── exercises.py
│   └── quiz.md
├── 03_packages/
│   ├── README.md
│   ├── examples.py
│   ├── exercises.py
│   └── quiz.md
├── 04_virtual_environments/
│   ├── README.md
│   ├── examples.py
│   ├── exercises.py
│   └── quiz.md
└── 05_dependency_management/
    ├── README.md
    ├── examples.py
    ├── exercises.py
    └── quiz.md

---

🔗 Why This Matters

Real-world Python projects are rarely single files. You need:

• Code reuse - Don't repeat yourself across files
• Organization - Group related functionality together
• Isolation - Keep project dependencies separate
• Reproducibility - Others can install the same packages

This module teaches the standard Python practices used in professional development.

---

Start here: 01_imports