Not a Python expert, but I doubt that they run your code differently.

As you describe your code (and assuming that you pass the tests before the bananas) it would return False (which is not the correct answer). But it is of course difficult to say without looking at the actual code.

It's not much but I hope it helps you forward.

Good Luck! :-)

Not an issue.

If you talking about javascript it is not issue. It's legal from es5. Moreover it's good practise: https://github.com/airbnb/javascript#commas--dangling