Python 把请求值为图片的替换为64位

import base64
class getValues(object):
    def __int__(self):
        pass
    def replace_target_Value(self,key,dic,changeData):
        if not isinstance(dic, dict):  # 对传入数据进行格式校验
            return 'argv[1] not an dict or argv[-1] not an list '
        if key in dic.keys():
            dic[key] = changeData  # 修改字典
        else:
            for value in dic.values():  # 传入数据不符合则对其value值进行遍历
                if isinstance(value, dict):
                    self.replace_target_Value(key, value, changeData)  # 传入数据的value值是字典，则直接调用自身，将value作为字典传进来
                    value[key] = changeData  # 替换key的value
                elif isinstance(value, (list, tuple)):
                    self.replace_target(key, value, changeData)  # 传入数据的value值是列表或者元组，则调用_get_value
        return dic

    # 替换参数子方法
    # 数据类型判断,遍历后分别调用不用的方法
    def replace_target(self, key, val, changeData):
        for val_ in val:
            if isinstance(val_, dict):
                self.replace_target_Value(key, val_, changeData)  # 传入数据的value值是字典，则调用replace_target_Value
            elif isinstance(val_, (list, tuple)):
                self.replace_target(key, val_, changeData)  # 传入数据的value值是列表或者元组，则调用自身

    def imgbase(self,file):
        with open(file, 'rb') as f:
            imgb64code = base64.b64encode(f.read())
            imgb64code=str(imgb64code, 'utf-8')
            return imgb64code

if __name__ == '__main__':
    tmp_list=[]
    tmp_dic={
                'respCode': '0000',
                'message': 'success',
                'data': {
                    'totalCount': 1,
                    'totalPage': 1,
                    'items': [{
                        'publishTime': 12345678910,
                        'totalAmount': 0,
                        'projectId': '789'
                    }]
                }
            }

    test_dic={
    "systemKey": "90DD2C2CB3C94E4698ED5A54EE6CAD4F",
    "honorType": "KAOLA_FACE_VALIDATE",
    "params": {
        "idCardName":"***","idCardCode":"5113211996012*****","validPhoto":"图片Base64字符串"
    },
    "idCertNo": "23022119880*****",
    "certType": "IDENTITY_CARD",
    "isRequestNew": True
}
    print(type(test_dic))
    #a=getValues().get_target_value(key='projectId',dic=test_dic,tmp_list=tmp_list)
    print('替换前:',test_dic)
    changeData=getValues().imgbase('/Users/../Desktop/1.jpeg')
    print(changeData)
    b=getValues().replace_target_Value(key='validPhoto',dic=test_dic,changeData=changeData)

    print('替换后:',b)