Great kata, submitting it was REALLY satisfying!
Instructions were quite wacky though. At the very start I didn't really know what does outputting mean (. and , instructions) and what I am supposed to return exactly, but after some time I finally understood it. The way _ and | were described is off as well. <, >, ^ and v were described like this: START MOVING to the direction, meanwhile _ and | were described like this: MOVE to the direction while it should be START MOVING to the direction just like in arrows case. Debugging code to fulfill tests requirements was painful as well.

I'm always very impressed when I'm struggling with a kata and then I find such simple solution - great job!

I didn't know you can convert range to list! Very clever.

That's because you're trying to iterate a NoneType object. Error raises if at least one of these arrays is None. Ciprian and I already explained you it in your previous question.

I forgot to convert balance to integer. Fixed that already :)

Thank you for the comment

No prob :)

ah ok thanks!

Instead of making such long wall of if statements you could just create a tuple of months, then look for index of month from current_date and expiration_date in this tuple and replace this month with index number.
For instance:

Months = ('January', 'February', 'March', 'April', 'May', 'June',
             'July', 'August', 'September', 'October', 'November', 'December')
a[0] = months.index(a[0])
b[0] = months.index(b[0])

I think this way would be easier and less backbreaking.

As I see while looking at others' solution I could use just one return statement at the end of function with Fn1*Fn2 = prod instead of ... == False. Wouldn't have to put if statement inside while loop and check it each time it repeats. My bad. I'm pretty proud of this code tho :)