import random
import itertools
outcomes = {'heads': 0, 'tails': 0}
sides = outcomes.keys()
a = []
for i in sides:
a.append(i)
for i in range(10000):
outcomes[random.choice(a)] += 1
print(outcomes['heads'])
print(outcomes['tails'])
http://dev.hortonworks.com.s3.amazonaws.com/HDPDocuments/HDP2/HDP-2-trunk/bk_system-admin-guide/content/ch_capacity-scheduler.html