This is an example (and test) of using swig generated modules in the context

of python3's namespace packages:

https://www.python.org/dev/peps/pep-0420/

Consequently, this example requires python (3.3 or newer) to build and run.

This example creates a simple swig module named robin. The robin.py module

has a companion C module named _robin.so. The robin module is tested in four

ways:

1) As a non-package module (tested by nonpkg.py)

2) With robin.py and _robin.so in the brave package under the path1

subdirectory. (tested by normal.py)

3) With robin.py in path2/brave and _robin.so in path3/brave

(tested by split.py)

4) With robin.py contained in a zip file (path4.zip) as brave/robin.py and

_robin.so found on the filesystem under path3/brave (tested by zipsplit.py)

Note: Using namespace packages with subpackages (such as brave.sir.robin) where

robin.py is located in a zipfile requires python-3.5.1 or newer as

python's zipimporter only worked with packages of depth 1 until then.