import math
 class Mod(object):
 	'''An undoable change to some object or item'''
 
 	def __init__(self):
 		pass
 
 	def modify(self, target):
 		pass
 
 	def revert(self, target):
 		pass
 
 class Boost(Mod):
 	name = 'boost'
 
 	def modify(self, target):
 		target.potency *= 1.5
 		result = math.ceil(target.potency)
 		target.potency = int(result)
 		target.name = 'boosted %s' % target.name
 	def revert(self, target):
 		target.potency /= 1.5
 		result = math.ceil(target.potency)
 		target.potency = int(result)
 		target.name = target.name.split(' ', 1)[1]