Particle Clicker Calculator

particle.py

import operator

class Trade:
    def __init__(self, name, value, cost):
        self.name = name
        self.value = value
        self.cost = cost

    def updateValue(self, newValue):
        self.value = newValue

    def updateCost(self, newCost):
        self.cost = newCost

    def ratio(self):
        return self.value/self.cost

class Group:
    def __init__(self, name):
        self.name = name
        self.trades = {}

    def addTrade(self, name, value, cost):
        self.trades[name] = Trade(name, value, cost)

    def printRatios(self):
        ratios = {}
        for t in self.trades:
            trade = self.trades[t]
            ratios[trade.name] = trade.ratio()

        ratiosSorted = sorted(ratios.iteritems(), key=operator.itemgetter(1))

        for n, r in ratiosSorted:
            print "%s:\t%f" % (n, r)

    def updateCost(self, name, cost):
        self.trades[name].updateCost(cost)

    def updateValue(self, name, value):
        self.trades[name].updateValue(value)

hr = Group('hr')
hr.addTrade('phd', 30, 70.0)
hr.addTrade('post', 59, 260.3)
hr.addTrade('fellow', 90, 249.4)
hr.addTrade('prof', 175, 720.6)
hr.addTrade('nobel', 850, 1600.0)
hr.addTrade('summer', 1000, 8100.0)
hr.printRatios()
print

research = Group('research')
research.addTrade('cpsymm', 5, 3.6)
research.addTrade('jthing', 9 ,1.6)
research.addTrade('tlepto', 74, 2.0)
research.addTrade('beauty', 146, 3.1)
research.addTrade('wzboso', 290, 5.5)
research.addTrade('topq', 2100, 64.0)
research.addTrade('antih', 7200, 156.3)
research.addTrade('bmeson', 7200, 125.0)
research.addTrade('higgs', 14400, 217.5)
research.printRatios()