python插入数据库数据时，报错%d format: a number is required, not str

python使用pymysql连接数据库，如果报错  %d format: a number is required, not str，直接把类型改为  %r,表示不管什么类型的字段，原样输出

例如，我的数据表字段第一个示int类型，插入数据时，我把第一个字段设置为%d,死活都报错，最后改为%r,问题解决，真的是浪费时间啊.............................................................................

if __name__ == '__main__':
    with MyConnectionPool() as db:
        db.cursor.execute("select * from review")
        db.conn.commit()
        for row in db.cursor.fetchall():
            print("nid:%d	 created_at:%s	 content:%s	 source:%s" % row)

        insert_sql = "insert into review (nid,created_at,content,source) VALUES (%r,%s,%s,%s)"
        insert_data = [(11,"2020.12.28","内容1","中国"),(22,"2020.12.29","2内容","riben")]
        # db.cursor.executemany(insert_sql,insert_data)
        with MyConnectionPool() as db:
            db.cursor.executemany(insert_sql,insert_data)
            db.conn.commit()
            for row in db.cursor.fetchall():
                print("nid:%d	 created_at:%s	 content:%s	 source:%s" % row)