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Rev 53 Rev 54
Line 29... Line 29...
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fdOut = None
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fdOut = None
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fTrace = 1
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fTrace = 1
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randcalls = 0
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randcalls = 0
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class Universe:
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class Universe:
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    p = 1               # probability of this universe existing
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    id = 0                              # id of last create Universe
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    def __init__(self, p, nWinners, nBallots, quota):
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        Universe.id += 1
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        self.id = Universe.id
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        self.p = p
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        self.nBallots = nBallots
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	self.nWinners = nWinners
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        self.quota = quota
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    winners = None
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        self.winners = []
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    losers = None
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        self.losers = []
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    tally = None
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        self.tally = {}
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    def getP(self):
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    def getP(self):
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        print "instance p =", self.p
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        print "instance p =", self.p
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        print "class p =", Universe.p
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        print "class p =", Universe.p
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print Universe.p
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x = Universe()
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print x.p
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x.p = 5
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print Universe.p
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print x.p
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x.getP()
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def trace(s):
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def trace(s):
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    global fTrace, fdOut
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    global fTrace, fdOut
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    if fTrace: print >>fdOut, s
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    if fTrace: print >>fdOut, s
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    return
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    return
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#       redistribute wasted votes to next priority candidate
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#       redistribute wasted votes to next priority candidate
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#
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#
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def dotally(nWinners, ballots):
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def dotally(nWinners, ballots):
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    global randcalls
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    global randcalls
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    randcalls = 0
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    randcalls = 0
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    nBallots = len(ballots)
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    quota = int(math.ceil((nBallots + 1.0)/(nWinners + 1)))
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    nBallots=len(ballots)
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    quota=int(math.ceil((nBallots + 1.0)/(nWinners + 1)))
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    universe = Universe(1.0, nWinners, nBallots, quota)
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    trace("INPUT SUMMARY AND SINGLE RUN TRACE")
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    trace("INPUT SUMMARY AND RUN TRACE")
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    trace("\t%d ballots" % nBallots)
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    trace("\t%d ballots" % universe.nBallots)
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    trace("\tChoosing %s winners" % nWinners)
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    trace("\tChoosing %s winners" % universe.nWinners)
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    trace("\tNeed ceil((%d + 1)/(%d + 1)) = %d ballots to win" %
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    trace("\tNeed ceil((%d + 1)/(%d + 1)) = %d ballots to win" %
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          (nBallots, nWinners, quota))
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          (universe.nBallots, universe.nWinners, universe.quota))
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    # Create initial tally and statistics
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    # Create initial tally and statistics
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    #
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    #
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    tally = {}
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    for ballot in ballots:
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    for ballot in ballots:
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        candidate = ballot[0]
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        candidate = ballot[0]
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        if not tally.has_key(candidate):
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        if not universe.tally.has_key(candidate):
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            tally[candidate] = []
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            universe.tally[candidate] = []
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        tally[candidate].append(ballot)
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        universe.tally[candidate].append(ballot)
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    total1st = {}
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    total1st = {}
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    total2nd = {}
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    total2nd = {}
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    totalMrk = {}
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    totalMrk = {}
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    trace("\n\tBALLOT MARKS\t1ST\t2ND\tNONE")
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    trace("\n\tBALLOT MARKS\t1ST\t2ND\tNONE")
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    candidates = totalMrk.keys()
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    candidates = totalMrk.keys()
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    candidates.sort()
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    candidates.sort()
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    for c in candidates:
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    for c in candidates:
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        trace("\t%-16s%3d\t%3d\t%4d" % (c, total1st[c], total2nd[c], len(ballots)-totalMrk[c]))
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        trace("\t%-16s%3d\t%3d\t%4d" % (c, total1st[c], total2nd[c], len(ballots)-totalMrk[c]))
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    traceTally(quota, tally)
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    traceTally(universe.quota, universe.tally)
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    winners = []
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    continueTally(universe)
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    losers = []
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    return universe.winners
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def continueTally(universe):
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    while len(winners) < nWinners:
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    while len(universe.winners) < universe.nWinners:
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        winner = findWinner(winners, losers, tally, quota, nWinners)
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        winner = findWinner(universe.winners, universe.losers, universe.tally, universe.quota, universe.nWinners)
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        if winner:
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        if winner:
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            winners.append(winner)
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            universe.winners.append(winner)
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            trace("\nSELECTION #%d: %s" % (len(winners), winner))
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            trace("\nSELECTION #%d: %s" % (len(universe.winners), winner))
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            redistributeWinner(winner, winners, losers, tally, quota)
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            redistributeWinner(winner, universe.winners, universe.losers, universe.tally, universe.quota)
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        else:
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        else:
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            loser = findLoser(losers, winners, tally)
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            loser = findLoser(universe.losers, universe.winners, universe.tally)
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            if loser:
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            if loser:
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                losers.append(loser)
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                universe.losers.append(loser)
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                trace("\nELIMINATED: %s" % loser)
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                trace("\nELIMINATED: %s" % loser)
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                redistributeLoser(loser, losers, winners, tally, quota)
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                redistributeLoser(loser, universe.losers, universe.winners, universe.tally, universe.quota)
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            else:
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            else:
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                trace("Not enough chosen candidates to fill all positions")
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                trace("Not enough chosen candidates to fill all positions")
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                break
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                break
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    trace("\nNumber of random choices made: %d" % randcalls)
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    trace("\nNumber of random choices made: %d" % randcalls)
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    return winners
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