Python - How To __init__.py in Python

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In Python, there are two types of packages named regular packages and namespace packages. The Regular packages exist in Python 3.2 and previous versions. These packages are used as a directory that contains the __init__.py file, which is implicitly called or executed.

The __init__.py file in Python lets the Interpreter knows that a directory contains a Python code in the module. This file can have the same code as any other Python module.

Files named as __init__.py are used to flag directories as Python packages.

For example,

mydir/spam/__init__.py mydir/spam/module.py 

If this file is removed, Python can not search for submodules in the directory, leading to failure in importing the module.

Main Reasons to Use __init__.py in Python

your_package/   __init__.py   file1.py   file2.py     ...   fileN.py 
  1. Using __init__.py will help in initializing some details like logging at the top.
import logging.config logging.config.dictConfig(Your_logging_config) 
  1. __init__.py helps in easing the import of files. A function fn() can be imported from a file filename.py when it is in a package.
from filename import fn() 

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