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

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