Question

Here's my answers for ps5. first portion: http://dpaste.com/hold/555367/ ghost game: http://dpaste.com/hold/555368/ I worked around the "do not mutate" problem by creating an identical list to mutate.

Answer 1

dictionaries have a copy method:
http://docs.python.org/library/stdtypes.html#mapping-types-dict

Answer 2

Oh ok. Thanks :)

Answer 3

It makes a shallow copy which I think is ok for this use.