Learn Python the Hard Way exercise 15

Hey there, absolute non-programmer here trying to do the first steps.

I'm kinda "stuck" on Exercise 15s Extra Credits.

Basically, I'd like to ask you guys how I'd close() the files I've opened in this script and would love if you could look at the comments I made above each line to check if they're somewhat correct.

http://pastebin.com/uwyh1A4C

>>7
Take your shitty book and fuck off back to the 3rd stall. Come back when you've scrubbed the remaining toilets.