操作pymsql报错

运行如下python脚本时，报错AttributeError: 'Mysql_op' object has no attribute 'cursor'，怎么也排查不出错误，在此请教有遇到类似问题的朋友，告知解决办法，谢谢。报错信息：’File "/root/PycharmProjects/Exam/libs/mysql_op.py", line 40, in
db.select('select * from emp;')
File "/root/PycharmProjects/Exam/libs/mysql_op.py", line 18, in select
self.cursor.execute(sql_text)
AttributeError: 'Mysql_op' object has no attribute 'cursor'

import pymysql
class Mysql_op:
    def __int__(self):
        self.db = pymysql.connect(host='127.0.0.1', port=3306, user='root', password='123', database='db_01', charset='utf8')
        self.cursor = self.db.cursor()
    # 查询方法
    def select(self, sql_text, many=True):
        self.cursor.execute(sql_text)
        if many:
            result = self.cursor.fetchall()
        else:
            result = self.cursor.fetchone()
        return result
    # 定义曾删改的公共操作方法
    def do(self, sql_text):
        try:
            self.cursor.execute(sql_text)
        except Exception as e:
            self.db.rollback()
            raise e
        self.db.commit()
        self.cursor.close()

    def exit(self):
        # self.cursor.close()
        self.db.close()

if __name__ == '__main__':
    db = Mysql_op()
    db.select('select * from emp;')

用Navicat连一下试试能连上这个库不？看代码没啥问题，应该是连接不到db