Data commit

Task/Monty-Hall-problem/Python/monty-hall-problem-1.py

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+'''
+I could understand the explanation of the Monty Hall problem
+but needed some more evidence
+
+References:
+  http://www.bbc.co.uk/dna/h2g2/A1054306
+  http://en.wikipedia.org/wiki/Monty_Hall_problem especially:
+  http://en.wikipedia.org/wiki/Monty_Hall_problem#Increasing_the_number_of_doors
+'''
+from random import randrange
+
+doors, iterations = 3,100000  # could try 100,1000
+
+def monty_hall(choice, switch=False, doorCount=doors):
+  # Set up doors
+  door = [False]*doorCount
+  # One door with prize
+  door[randrange(doorCount)] = True
+
+  chosen = door[choice]
+
+  unpicked = door
+  del unpicked[choice]
+
+  # Out of those unpicked, the alternative is either:
+  #   the prize door, or
+  #   an empty door if the initial choice is actually the prize.
+  alternative = True in unpicked
+
+  if switch:
+    return alternative
+  else:
+    return chosen
+
+print "\nMonty Hall problem simulation:"
+print doors, "doors,", iterations, "iterations.\n"
+
+print "Not switching allows you to win",
+print sum(monty_hall(randrange(3), switch=False)
+          for x in range(iterations)),
+print "out of", iterations, "times."
+print "Switching allows you to win",
+print sum(monty_hall(randrange(3), switch=True)
+          for x in range(iterations)),
+print "out of", iterations, "times.\n"

Task/Monty-Hall-problem/Python/monty-hall-problem-2.py

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+import random
+ #1 represents a car
+ #0 represent a goat
+
+stay = 0  #amount won if stay in the same position
+switch = 0 # amount won if you switch
+
+for i in range(1000):
+    lst = [1,0,0]           # one car and two goats
+    random.shuffle(lst)     # shuffles the list randomly
+
+    ran = random.randrange(3) # gets a random number for the random guess
+
+    user = lst[ran] #storing the random guess
+
+    del(lst[ran]) # deleting the random guess
+
+    huh = 0
+    for i in lst: # getting a value 0 and deleting it
+        if i ==0:
+            del(lst[huh]) # deletes a goat when it finds it
+            break
+        huh+=1
+
+    if user ==1: # if the original choice is 1 then stay adds 1
+        stay+=1
+
+    if lst[0] == 1: # if the switched value is 1 then switch adds 1
+        switch+=1
+
+print("Stay =",stay)
+print("Switch = ",switch)
+#Done by Sam Witton 09/04/2014