As per the example in the previous blog entry. You can use one of Mayas API classes to translate a python array data variable to something that the MVector class can read. (remember SWIG and C++ ...)

import maya.OpenMaya as ommyArray= om.MScriptUtil()
myArray.createFromList([1.0, 1.0, 1.0], 3)

vec= om.MVector( myArray.asDoublePtr() )
print vec.x vec.y, vec.z