Map-summing items in a multidimensional array
[ (0.5, 0.6, 0.7), (0.1, 0.9, 0.8), (0.9, 1.0, 0.4),
  ...
  (0.3, 0.8, 0.3), (0.2, 0.4, 0.9), (0.5, 0.5, 0.3) ]

>>> c=[ (0.5, 0.6, 0.7), (0.1, 0.9, 0.8), (0.9, 1.0, 0.4),(0.5, 0.6, 0.7), (0.1, 0.9, 0.8), (0.9, 1.0, 0.4),(0.5, 0.6, 0.7), (0.1, 0.9, 0.8), (0.9, 1.0, 0.4)]
>>> [ sum([t[i] for t in c]) for i in range(len(c[0]))]
[4.5, 7.5, 5.6999999999999993]

result = reduce(lambda x, y: tuple((xi + yi) for (xi, yi) in zip (x, y)), l)

>>> reduce(lambda x, y: (x[0]+y[0], x[1]+y[1], x[2]+y[2]), [(1, 2, 3), (2, 3, 4), (4, 5, 6)])
(7, 10, 13)

values = [(1,2,3), (4,5,6)]
print map(sum, values)