爬取数据的存储问题 about weibocrawler HOT 2 CLOSED

def process_item(self, item, spider):
    base_dir = '结果文件' 
    if not os.path.isdir(base_dir):
        os.makedirs(base_dir)
    file_path = base_dir + os.sep + 'Userinfo' + '.csv'
    if not os.path.isfile(file_path):
        is_first_write = 1
    else:
        is_first_write = 0
    if item:
        with open(file_path, 'a', encoding='utf-8-sig', newline='') as f:
            writer = csv.writer(f)
            if is_first_write:
                header = [
                    'id', 'nick_name', 'user_id', 'gender', 'brief_introduction', 'mblogs_num',
                    'follows_num', 'fans_num', 'vip_level', 'authentication', 'verified_type',  '_level'
                ]
                writer.writerow(header)
            writer.writerow(
                [item[key] for key in item.keys()])
    return item