# -*- coding: cp936 -*-
# This program will calculate how much eachone should pay in a AA activity.
# Two files are needed:
# * members: This file has a list of all members of the activity. One member per line
# * expenses: This file has a list of all expenses. Each line is {Payer name};{Expense Description};{Amount}

def getMemberCount():
    members = open('members').readlines()
    for member in members:
        member = str.rstrip(member)
    return len(member)

def getAverageExpense():
    sum = 0
    expenses = open('expenses').readlines()
    for expense in expenses:
        sum += int(expense.split(';')[2])
    return sum / getMemberCount()
    
def calculateHowMuchEachMemberHasPaid():
    dic = {}
    expenses = open('expenses').readlines()
    for s in expenses:
        items = s.split(';')
        if dic.has_key(items[0])==False:
          dic[items[0]] = int(items[2])
        else:
          dic[items[0]] += int(items[2])

    return dic
    
def calculateHowMuchEachMemberShouldPay(dic, average):
    members = open('members').readlines()
    for member in members:
        member = str.rstrip(member)
        if dic.has_key(member)==False:
            dic[member] = average
        else:
            dic[member] = average - dic[member]
            
    return dic
    
if __name__ == "__main__":
    averageCost = getAverageExpense()
    print "平均支出: " + str(averageCost) + "\n"
    
    report = calculateHowMuchEachMemberShouldPay(calculateHowMuchEachMemberHasPaid(), averageCost)
    print "支出報表"
    for name in report.keys():
        print name + " : " + str(report[name])