The role of the __init__.py file in Python2

The role of the __init__.py file in Python2:

1, Python each module of the package, must have a __init__.py file, with this file, we can import the module in this directory.

2. Other functions of __init__.py:

On a point, our __init__.py is empty. In fact, __init__.py inside can still have content, we import a package, actually imported its __init__.py file.

We can import other packages, or modules, in the __init__.py file.

Content of __init__.py:

Import Module1

Import Module11

Import Module12 This way, when we import this package, the __init__.py file runs automatically. To help us import so many modules, we do not need to write all the import statements in a file, but also reduce the amount of code. There is no need to import the module.

There is also an important variable in __init__.py, called __all__. We sometimes take a trick of "import All", which is this:

From PackageName Import *
Import then imports the sub-modules and sub-packages that are registered in the __ALL__ list in the package __init__.py file into the current scope. Like what:

#文件__init__. py

__all__ = ["Module1", "Module2", "SubPackage1", "SubPackage2"]

The role of the __init__.py file in Python2