See here not finished impl of http://www.hackerfactor.com/blog/index.php?/archives/860-The-Oligarchy-Game.html

oli.py

import random

class Person:
    def __init__(self,id):
        self.amount = 100
        self.id = id
    def __repr__(self):
        return str(self.id) + " :: " + str(self.amount)

# setup
COUNT = 20
people = []
for i in range(COUNT):
    people.append(Person(i))

def singleround():    
    # start round
    choosefrom = []
    for i in range(COUNT):
        choosefrom.append(people[i])
    for i in range(int(COUNT/2)):
        p1 = random.choice(choosefrom)
        choosefrom.remove(p1)
        p2 = random.choice(choosefrom)
        choosefrom.remove(p2)

        # now battle
        betamount = 0
        if p1.amount<p2.amount:
            betamount = int(p1.amount/2)
        else:
            betamount = int(p2.amount/2)

        rnum = random.random()
        if rnum>0.50:
            # in this case p1 won
            p1.amount = p1.amount+ betamount
            p2.amount = p2.amount - betamount
        else:
            # p2 won
            p2.amount = p2.amount + betamount
            p1.amount = p1.amount - betamount

for i in range(10):
    singleround()
print(people)