I use Python.
My code is:
It says that:
Unsuported Compare operator: undefined
Please help, I have no idea what could it be
I don’t see any problem with the code in your screenshot. Can you copy and paste the whole code here?
I suppose your problem is here:
distance = nearestEnemyDistance ()
You placed the whitespace between the function’s name and brackets.
This extra space catches my eye too, but I tried to put the same extra space into right code and - ta-daa! - it worked) So, maybe, it really could be something in the first four lines…
Hm. Ok. Then we are waiting the full code 
the first lines are only comments
Anyway, please, post the whole your code. Without it we can’t help you.