Use pymysql to extract data from the database

Beginner python, please also give pointers to the passing gods

#导入pymysql库
import pymysql
#链接数据库
conn = pymysql.connect(host='hostname', user='mysql_user_name', password='mysql_pwd', db='db_name', charset='utf8')

#创建游标对象
cursor = pymysql.cursors.SSCursor(conn)

#sql 语句
sql = "seletc * from table_name"

#执行sql语句
cursor.execute(sql)

#提取执行的返回值
while True:
	row = cursor.fetchone()
	if not row:
		break;
	print(row)

#关闭游标
cursor.close()
#关闭连接
conn.close()