Fix irrelevant whitespace
Move to new style classes
Stop overriding builtins
Wrap game launching in if main statement
Use generator expressions and min to shorten closest_monster
Remove unneeded global statements
Extract constant data to own file
Extract map helpers to there own file
Break code into multiple modules

To do this I have:
Remove allot of reliance on globals
Changed how messages are handled
Made an inventory an attribute of the player