def merge_dicts()

in otava/util.py [0:0]

• 18 lines of code
• 10 McCabe index (conditional complexity)

def merge_dicts(d1: Dict, d2: Dict) -> OrderedDict:
    """
    Returns a sum of two dictionaries, summing them left-to-right.
    Lists and sets under the same key are added.
    Dicts with the same key are merged recursively.
    Simple values with the same key are overwritten (right dictionary wins).
    Maintains the order of the sets.
    """
    result = OrderedDict(d1)
    for k in d2.keys():
        v1 = d1.get(k)
        v2 = d2.get(k)
        if v2 is None:
            result[k] = v1
        elif v1 is None:
            result[k] = v2
        elif isinstance(v1, Dict) and isinstance(v2, Dict):
            result[k] = merge_dicts(v1, v2)
        elif isinstance(v1, List) and isinstance(v2, List):
            result[k] = v1 + v2
        elif isinstance(v1, Set) and isinstance(v2, Set):
            result[k] = v1 | v2
        else:
            result[k] = v2

    return result