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tedtieken/gist:6567112

Created September 15, 2013 00:50
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Demonstrating that the two envelopes paradox is actually a fallacy.
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gistfile1.txt
import random
envs = [10.0, 20.0]
rounds = 10000
total_stay = 0
for x in xrange(rounds):
  t_envs = envs[:]
  random.shuffle(t_envs)
  choice = t_envs.pop()
  total_stay += choice
total_switch = 0
for x in xrange(rounds):
  t_envs = envs[:]
  random.shuffle(t_envs)
  choice = t_envs.pop()
  new_choice = t_envs.pop()
  total_switch += new_choice
d_rounds = rounds * 1.0
print total_stay / d_rounds 
print total_switch / d_rounds
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