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How to develop programs with Python Namespaced Packages?
In Python, a namespace package allows you to spread Python code among several projects. This is useful when you want to release related libraries as separate downloads. For example, with the directories Package-1 and Package-2 in PYTHONPATH,
Package-1/namespace/__init__.py Package-1/namespace/module1/__init__.py Package-2/namespace/__init__.py Package-2/namespace/module2/__init__.py the end-user can import namespace.module1 and import namespace.module2.
On Python 3.3, you don't have to do anything, just don't put any __init__.py in your namespace package directories and it will just work. This is because Python 3.3 introduces implicit namespace packages.
On older versions, there's a standard module, called pkgutil, with which you can 'append' modules to a given namespace. You should put those two lines in both Package-1/namespace/__init__.py and Package-2/namespace/__init__.py: from pkgutil import extend_path __path__ = extend_path(__path__, __name__)
This will add to the package's __path__ all subdirectories of directories on sys.path named after the package. After this you can distribute the 2 packages separately and leverage python namespaced packages.
Updated on: 01-Oct-2019
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