Is there a Vector3 type in Python?
I don't believe there is anything standard (but I could be wrong, I don't keep up with python that closely).
It's very easy to implement though, and you may want to build on top of the numpy array as a container for it anyway, which gives you lots of good (and efficient) bits and pieces.
I quickly checked numPy but it looks like it's using arrays as vectors? I am looking for a proper Vector3 type that I can instance and work on.