Hmm. Looks like you found (and fixed) an error I hadn't seen (but was there the whole time). The error mentioned in #26 (as it came up in a hackathon two days ago) was when giving a totally non-existent filename (i.e. messing up the name when typing it), but none of us tried to make a file located on a sub-dir (locally) and so we never caught this.
So some extra thank you for fixing something that would have had me scratching my head when it came up :)
(As for the cause of #26 it's the fact that despite using the with open() syntax we get the file's length before and cast it to an int, found it a few moments ago and will patch asap).
Thank you again for your contribution and I hope to see you around again soon.
Cheers!