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Just wanting to know how I would accomplish something like this as a 1 liner with list comprehension, just simple subtracting list index 1 from 0, for each sublist of the main list.
value = [[-20, 20], [-20, 20], [32, 32]]
value[0] = value[0][0] - value[0][1]
value[1] = value[1][0] - value[1][1]
value[2] = value[2][0] - value[2][1]
Simple: