That's a good point. It's up to you. This one is just a suggestion and not a requirement. 

I just felt it would help consistency across the paper and might alleviate criticisms down the road (a number of people in the community have the view that, if possible, python code should conform to pep8.) That's a suggestion, though, not a command, since I recognize that style decisions are very personal and it would be an inconvenience to alter your code to match this paper. 

All that said, if you're interested, there's a fun tool to help you convert your code. It's called autopep8. https://pypi.python.org/pypi/autopep8/0.5.2 .