Return a list of the cumulative sums of the elements in l.
Note
len(listtools.cumulative_sums(l)) == len(l).
abjad> listtools.cumulative_sums([1, 2, 3, 4, 5, 6, 7, 8])
[1, 3, 6, 10, 15, 21, 28, 36]
abjad> listtools.cumulative_sums([1, -2, 3, -4, 5, -6, 7, -8])
[1, -1, 2, -2, 3, -3, 4, -4]
Raise TypeError when l is neither list nor tuple:
abjad> listtools.cumulative_sums('foo')
TypeError
Raise ValueError when l is empty:
abjad> listtools.cumulative_sums([ ])
ValueError