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Explanation

__init__.py is a special file in Python that marks a directory as a package. It runs automatically when the package is imported. It can be empty or contain initialization logic.

Code:

# Directory structure
# mypackage/
# ├── __init__.py
# ├── module1.py
# └── module2.py

Explanation

You can import modules or functions inside __init__.py to control what is accessible when importing the package. This simplifies imports for users.

Code:

# __init__.py
from .module1 import greet

# Usage:
# from mypackage import greet

Explanation

Variables defined inside __init__.py become package-level attributes. This is useful for versioning and configuration settings.

Code:

# __init__.py
version = '1.0.0'

# Usage:
# import mypackage
# print(mypackage.version)