README.md

Module 064: Packages and __init__.py

• Phase: 7. Modules, Stdlib & Testing
• Duration: 1.5 hours

Learning Objectives

• Understand packages as directories of modules
• Use __init__.py to control package initialization
• Navigate subpackages with absolute and relative imports
• Control exports with __all__
• Understand namespace packages (PEP 420)

Topics Covered

• Packages as directories with __init__.py
• Purpose of __init__.py (can be empty or contain initialization code)
• Subpackages and nested package structures
• Absolute imports (from package import module)
• Relative imports (from . import, from .. import)
• __all__ attribute to control from package import *
• Namespace packages (PEP 420) — implicit packages without __init__.py

Prerequisites

Module 063: Modules and Imports

Next Module

Module 065: Virtual Environments and pip