The __init__.py file is essential for declaring a directory as a regular Python package. This file allows users to import entire directories or specific modules, enhancing the project structure and code reusability. The file can remain empty to serve solely as a marker, or it can contain executable code, which will run upon package import. This code can import other modules and define functions and data, making them accessible to the importing module.
The special file __init__.py serves as a marker to indicate that its containing directory is a regular package. When people talk about a package in Python, they generally mean a regular package.
The existence of __init__.py makes the Python loader identify its containing directory as a regular package. This means you can import the whole directory, specific modules within it, or even individual functions, variables, and classes.
If __init__.py does contain code, then that code will be executed when the package is first imported. It can import other modules or packages and define its own functions or data.
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