Common singleton functions traverse dictionary functions

def singleton(cls):
    _instance = {}

    def _singleton(*args, **kwargs):
        if cls not in _instance:
            _instance[cls] = cls(*args, **kwargs)
        return _instance[cls]

    return _singleton


def get_dict(dict1, obj, default=None):
    """  Traverse nested dictionaries , Get what you want value
        dict1 Dictionary to traverse 
        obj  what is needed value Key """
    for k, v in dict1.items():
        if k == obj:
            return v
        else:
            if type(v) is dict:  #  If it's a dictionary 
                re = get_dict(v, obj, default)  #  recursive 
                if re is not default:
                    return re