Updated to Python3

Turns out @adosreis couldn't get the code working because he was using Python3 and I was using Python2. I've since updated to 3 and this commit makes the code work in 3. I'll let @adosreis decide if he's going to merge and convert to Python3, or ignore it and stay on Python2.

Also of note, you now *don't* put double quotes around the input, so it instead becomes:

```
Which pack?REDU-EN
```

To get REDU. I also couldn't work out how to get the imports working without keeping the namespace, so I shortened the namespace. Hopefully it doesn't matter because the end result works the same.