It's a very simple question, but I wonder if there is a more pythonic way to add each previous elements in a list like this (for example with a list comprehension maybe) :

input : L = [4, 2, 1, 3] output : new_L = [4, 6, 7, 10] 

Which I've done this way :

def add_one_by_one(L): new_L = [] for elt in L: if len(new_L)>0: new_L.append(new_L[-1]+elt) else: new_L.append(elt) return new_L new_L = add_one_by_one(L)