Creating Packages (__init__.py)

# Package structure:
# myproject/
#   __init__.py          # makes it a package
#   utils.py             # module
#   database/
#     __init__.py         # sub-package
#     connection.py
#     models.py
#   api/
#     __init__.py
#     routes.py
#     middleware.py

# __init__.py can be empty or configure imports:
# ---- myproject/__init__.py ----
# from .utils import helper_function
# from .database import connect
# __all__ = ["helper_function", "connect"]

# Importing from packages:
# from myproject import helper_function
# from myproject.database import connect
# from myproject.api.routes import router

# Demo: simulating a package structure
class Package:
    """Demonstrates package organization"""
    
    class Utils:
        @staticmethod
        def format_currency(amount):
            return f"${amount:,.2f}"
    
    class Database:
        @staticmethod
        def connect():
            return "Connected to DB"
    
    class API:
        @staticmethod
        def get_users():
            return [{"id": 1, "name": "Alice"}]

# Usage
print(Package.Utils.format_currency(1234567.89))
print(Package.Database.connect())
print(Package.API.get_users())