If python module or package is added from the project node, module or package is not visible from the project window.
From the Files window, the added module or package is under the project directory on the same level as 'src' and
'nbproject' directories. By default, when creating mew module from other types of projects (eg java, ruby, etc.), newly
created module goes to the default package so that they are visible in the projects window.

- create a python project
- right click on the python project and select New->Empty Module|Executable Module|Python Package
Result: the newly created module or package is not displayed under the python project from the projects window.