Concise vector adding in Python? [duplicate]

If you need efficient vector arithmetic, try Numpy.

>>> import numpy
>>> a=numpy.array([0,1,2])
>>> b=numpy.array([3,4,5])
>>> a+b
array([3, 5, 7])
>>> 

Or (thanks, Andrew Jaffe),

>>> a += b
>>> a
array([3, 5, 7])
>>>