_mysql_connector.MySQLInterfaceError: Access denied for user 'your_username'@'localhost' (using password: YES)

This error occurs when the user specified in the code is denied access to the MySQL database. The possible reasons for this error are:

1. Incorrect username or password: Check the username and password specified in the code and ensure that it matches the ones used to access the database.

2. Insufficient privileges: The user specified may not have the necessary privileges to access the database. Check the permissions granted to the user and ensure that they have the required privileges.

3. Incorrect hostname: The hostname specified in the code may not match the one used to access the MySQL database. Check the hostname and ensure that it is correct.

To resolve this error, ensure that the correct username, password, hostname, and database name are specified in the code. Also, ensure that the user specified has the necessary privileges to access the database.