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numpy: point sum
>>> from pandac.PandaModules import Vec3
>>> import numpy
>>> l = []
>>> l.append( Vec3(1,1,1) )
>>> l.append( Vec3(1,1,1) )
>>> l.append( Vec3(1,1,1) )
>>> Vec3(1,1,1)+Vec3(1,1,1)
Vec3(2, 2, 2)
>>> sum(l)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: unsupported operand type(s) for +: 'int' and 'libpanda.Vec3'
>>> numpy.sum(l)
9.0
>>>

>>> my_smart_sum(l)
Vec3(3,3,3)

sum(l, start=Vec3(0,0,0))

numpy.sum(l, axis=0)

python -m timeit "import numpy; foo = [[1,1,1],[1,1,1]]" "numpy.sum(foo, axis=0)"
10000 loops, best of 3: 46.5 usec per loop