{('20144', '4'): [12321.88, 5861.56], ('20144', '31'): [30965.4], ('20143',
    '4'): [52490.46], ('20144', '2'): [12911.5, 17355.1], ('20143', '31'):
    [5700.53]}
Python summing elements of one dict if the have a similar key(tuple)