combining lists in a dictionary

[MckJohan]

just straightly pass the dict to sum function. 2nd arguments is just optional to add the result. hope this will help.

>>> dict = {'a':[1,2,3,4,5], 'b':[5,10,15,20]}
>>> sum(dict['a'])
15
>>> sum(dict['a'], 5)
20
>>> sum(dict['b'])
50
>>> sum(dict['b'], 50)
100
>>>