addition of elements within an array in python while loop : I have a numpy array full of numbers which I want to add to each other. For example if the list is [2,3,4,5,6]. I want to add 3 to 2 (index 1 to 0) and the 4 to 3 (index 2 to 1) and so on. 

I've been stressing out trying to figure out a while statement which goes through the array doing the additions and then adding these to a new array.

Any help or ideas for this would be great as I'm quite new to python and coding and am rather stuck.