# 引入pymysql模块
import pymysql
# 创建连接对象
cnn = pymysql.connect(
    host='127.0.0.1',
    port=3306,
    user='root',
    password='123456',
    database='my_test',
    charset='utf8'
)
# 使用上下文管理器的语法
with cnn:
    with cnn.cursor(cursor=pymysql.cursors.DictCursor) as cur:
        # 其它的代码
        # 准备sql语句
        my_sql = "select * from student;"
        # 执行sql语句
        cur.execute(my_sql)
        # 查看sql
        data = cur.fetchall()
print(data)