Alt text for an image of code

Hello, I am looking for guidelines on what to do when writing alt text for
images of code, for example, Python or Java. I can't find any specific
guidance on the W3 site. Can you help, please?

https://www.w3.org/WAI/tutorials/images/complex/

Sincerely,
Stephanie

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Stephanie Hibner LLC
Copyeditor | Proofreader