The error NameError: name '_mysql' is not defined usually indicates that the _mysql module is not imported or installed in your Python code.

To fix this error, you will need to install the _mysql module by running the following command:

pip install mysql-python

You can then import the _mysql module in your code by adding the following line at the top of your Python file:

import _mysql

If you are using a different version of the MySQL connector or a different MySQL library, you may need to import a different module. You can check the documentation for the library you are using to determine the correct import statement.

Once you have imported the _mysql module, you should be able to use it to connect to a MySQL database and execute MySQL queries in your Python code.