import spam, numpy

a = spam.vector3d()
a[0] = 1
a[1] = 2
a[2] = 3
print a

b = numpy.array([1.4, 1.1, 0.7])
print b

m = memoryview(a)
print m.ndim
print m.shape
print m.tobytes()

c = a + b
print c

//////////////////////////////////////////////////////////////////////////////////

xxx@ThinkPad-E525:~/Workspace/experimental/buffer protocol/swig$ python example.py
<Swig Object of type 'vector3d *' at 0x7f21a2d76260>
[ 1.4  1.1  0.7]
1
(3L,)
�?@
[ 2.4  3.1  3.7]