_mysql_connector.MySQLInterfaceError: Access denied for user 'root'@'localhost'

This error message indicates that the user 'root' does not have permission to access the MySQL server running on 'localhost'. This can happen for a number of reasons, such as an incorrect password or incorrect permissions set up for the user.

To fix this error, you can try the following steps:

1. Check that the password for the 'root' user is correct. You can do this by logging in to the MySQL server using a different user with administrative privileges and resetting the password for the 'root' user.

2. Check that the 'root' user has been granted the necessary permissions to access the MySQL server. You can do this by logging in to the MySQL server using a different user with administrative privileges and granting the necessary permissions to the 'root' user.

3. Check that the MySQL server is running on 'localhost'. If the server is running on a different host, you may need to specify the correct host name or IP address when connecting to the server.

4. Check that the MySQL server is configured to allow remote connections from the host where your application is running. If remote connections are not allowed, you may need to configure the server to allow them or move your application to a host that is allowed to connect.

If none of these steps resolve the issue, you may need to consult the MySQL documentation or seek assistance from a MySQL administrator.