undefined name 'io'

The error message "undefined name 'io'" suggests that the code is trying to reference an object or module named "io" that has not been defined or imported properly.

In Python, "io" is a built-in module that provides tools for working with input and output streams, such as reading and writing files. To use this module, you need to import it at the beginning of your script:

import io

# Now you can use functions from the io module, such as open() to read and write files

If you are still encountering issues with the "undefined name 'io'" error message, make sure that you have spelled the module name correctly and that you are using the correct version of Python that supports the io module.