循环替换字典中的None值：

class Gsxt:
    """
    
    """

    def __init__(self, company_name, city):
        pass

    def replace_dict(self, tmp_dict_or_list):
        if isinstance(tmp_dict_or_list, dict):
            for k, v in tmp_dict_or_list.items():
                if isinstance(v, (dict, list)):
                    tmp_dict_or_list[k] = self.replace_dict(v)
                else:
                    if v is None:
                        tmp_dict_or_list[k] = ""
        elif isinstance(tmp_dict_or_list, list):
            for i, value in enumerate(tmp_dict_or_list):
                if isinstance(value, (dict, list)):
                    tmp_dict_or_list[i] = self.replace_dict(value)
                else:
                    if value is None:
                        tmp_dict_or_list[i] = ""
        return tmp_dict_or_list