无法连接到mysql数据库

sudo systemctl status mysql

sudo systemctl start mysql

import mysql.connector

mydb = mysql.connector.connect(
  host="localhost",
  user="yourusername",
  password="yourpassword",
  database="yourdatabase"
)

sudo ufw allow 3306

GRANT ALL PRIVILEGES ON yourdatabase.* TO 'yourusername'@'localhost';
FLUSH PRIVILEGES;

bind-address = 0.0.0.0

import mysql.connector

try:
    connection = mysql.connector.connect(
        host='localhost',
        user='yourusername',
        password='yourpassword',
        database='yourdatabase'
    )

    if connection.is_connected():
        cursor = connection.cursor()
        cursor.execute("SELECT VERSION()")
        version = cursor.fetchone()
        print("MySQL Database Version : ", version)

except mysql.connector.Error as e:
    print("Error while connecting to MySQL", e)
finally:
    if connection.is_connected():
        cursor.close()
        connection.close()