The role of __init__.py in Python packages

1. __init__.py defines the properties and methods of the package

Generally empty file, but must exist, no __init__.py indicates that his directory is not a package

2. When importing the package, use

For example, there is a test directory with xx1.py,xx2.py,__init__.py three files under test

| Test

| | __init__.py

| | xx1.py

| | xx2.py

The test can be imported as a package, importing all the files under test

From Test import *

The actual import is the variable __all__ in __init__.py, i.e. __all__ = [' xx1 ', ' xx2 ']

3. __init__.py Add Library

For example, in __init__.py, edit the following:　

1 Import Re 2 Import OS

Then __all__ = [' re ', ' OS ']

The role of __init__.py in Python packages