def rec_cumsum(numbers):
    ''' Input: numbers - a list of numbers,
            Output: a list of cumulative sums of the numbers'''
    new_list=numbers
    last=new_list[-1]
    if numbers==[]:
         return numbers
    if len(numbers) == 1:
         return numbers[0]
    new_list.remove(last)
    rec= rec_cumsum(new_list)
    new_list.append(rec+last)
    return last+rec
    
tests = [[],
         [1],
         [1,2],
         [1,2,3],
         [1,2,1,3],
         ]
for t in tests:
    print(rec_cumsum(t))