This is a stupid one.

I was getting the Python error: “AttributeError: ‘module’ object has no attribute ‘mailbox'”

I read this helpful guide, which didn't fix it. I then realised that I had 'import mailbox' in the head of the python file, and the python file itself was called 'mailbox.py': Python takes files in the local folder as higher priority than the modules in the main installation.

Moral of the story: don't name your python files the same as any of the modules you're importing.

Oops!