连接mysql报错

ERROR 2003 (HY000): Can't connect to MySQL server on 'localhost' (10061)

ERROR 1045 (28000): Access denied for user 'username'@'localhost' (using password: YES)

ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock'

ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)

import mysql.connector

try:
    connection = mysql.connector.connect(
        host='localhost',
        user='username',
        password='password',
        database='database_name'
    )
    print("Connection successful!")
except mysql.connector.Error as err:
    print(f"Error: '{err}'")
finally:
    if connection.is_connected():
        connection.close()