合并2个嵌套字典，得到单个字典

def merge_dicts(dict1, dict2):
    merged_dict = dict1.copy()  # 复制第一个字典，以免修改原字典
    for key, value in dict2.items():
        if key in merged_dict and isinstance(merged_dict[key], dict) and isinstance(value, dict):
            # 如果key在merged_dict中，并且对应的值都是字典类型，则递归合并字典
            merged_dict[key] = merge_dicts(merged_dict[key], value)
        else:
            # 否则直接将value赋给merged_dict[key]
            merged_dict[key] = value
    return merged_dict