python 字典嵌套（列表及字典）取值/统计方案

class DictionaryProcessingSet:
    result_dict = {}

    def get_key(self, data: dict, demand: list, countKey: str = ''):
        """
        :param data: 入参数据
        :param demand: 你的需求参数
        :param countKey: 参数统计次数
        :return:
        """
        if isinstance(data, dict):  # 判断入参数据是否是dict类型
            for demand_i in demand:  # 根据你的需求参数遍历
                if demand_i in str(data):  # 判断需求参数是否存在与入参数据中
                    for key in data.keys():  # 根据入参数据key进行遍历
                        if demand_i == key:  # 如果入参数据得key=需求参数那就输出
                            self.result_dict[key] = data[key]
                            break
                        elif isinstance(data[key], dict):  # 如果最外层key找不到，那就根据value是否是dict进入内层寻找
                            self.zero_time_variable = []  # 储存当前需求参数
                            if demand_i in str(data[key]):  # 根据需求参数判断是否存在于value得dict中
                                self.zero_time_variable.append(demand_i)
                                self.get_key(data[key], self.zero_time_variable,countKey)  # 拿到内层得dict进行新一轮得循环
                        elif isinstance(data[key], (tuple, list)):  # 判断当前key值是否是dict或者tuple
                            for data_i in data[key]:  # 循环list
                                if demand_i in str(data_i) and isinstance(data_i, dict):  # 判断需求参数是否存在且内部类型是dict
                                    self.get_key(data_i, self.zero_time_variable,countKey)  # 拿到内层得dict进行新一轮得循环

                else:
                    self.result_dict[demand_i] = '未查询到该key'  # 需求参数不在入参数据中
        countName = countKey + "共计"
        self.result_dict[countName] = str(data).count(countKey)  # 统计某个参数在当前入参数据中出现得次数
        return self.result_dict


dictData = {
    "name": "John",
    "age": 30,
    "wife": {
        "firstWife": "王丽",
        "secondWife": "李银",
    },
    "child": {
        "boy": '赵明',
        "girl": '赵琴',
        "wife": '小三',
        "sunDynasty": {
            "sunBoy": '赵鹏鹏',
            "sunGirl": '赵茵茵',
            "greatGrandson": [
                {"greatSunBoy": '赵阳'},
                {"greatSunGirl": '赵雨'},
            ]
        }
    }
}
"""如何知道某一个值是否存在变量中"""
seek = DictionaryProcessingSet().get_key(dictData, ['greatSunGirl', 'girl', 'age', 'firstWife', 'wife', '我不在哦', 'sunGirl'], 'wife')
print(seek)
"""
结果：{'greatSunGirl': '赵雨', 'wife共计': 2, 'girl': '赵琴', 'age': 30, 'firstWife': '王丽', 'wife': {'firstWife': '王丽', 'secondWife': '李银'}, '我不在哦': '未查询到该key', 'sunGirl': '赵茵茵'}
"""