def sumMerge(dict1, dict2):
    """
    Adds two dictionaries together, and merges into the first, dict1.
    Returns first dict.
    """
    for key in dict2:
        dict1[key] = list(map(lambda a,b: a + b, dict1.get(key, [0,0,0,0]), dict2[key]))
    return dict1
def sumMerge ( dict1 , dict2 ) : for key in dict2 : dict1 [ key ] = list ( map ( lambda a , b : a + b , dict1 . get ( key , [ 0 , 0 , 0 , 0 ] ) , dict2 [ key ] ) ) return dict1
Adds two dictionaries together, and merges into the first, dict1.
    Returns first dict.