python2合并多个字典

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def union_dict(*objs):
    _keys = set(sum([obj.keys() for obj in objs],[]))
    _total = {}
    for _key in _keys:
        _total[_key] = sum([obj.get(_key,0) for obj in objs])
    return _total

obj1 = {'a':1,'b':2,'c':3}
obj2 = {'a':1,'b':3,'d':4}
print union_dict(obj1,obj2)