MySQLdb.OperationalError: (1049, "Unknown database 'testdb'")

This error message indicates that the database 'testdb' does not exist in the MySQL server.

To resolve this error, you can create the 'testdb' database in MySQL by running the following SQL command in MySQL shell or through a MySQL client:

CREATE DATABASE testdb;

Alternatively, you can use an existing database by modifying your code to use the correct database name.