tasks a-s

Task/Rock-paper-scissors/Python/rock-paper-scissors.py

@@ -0,0 +1,66 @@
+#!/usr/bin/python
+from random import choice, randrange
+from bisect import bisect
+from collections import defaultdict
+
+WHATBEATS = {   'paper' : 'scissors',
+                'scissors' : 'rock',
+                'rock' : 'paper'        }
+
+ORDER = ('rock', 'paper', 'scissors')
+
+CHOICEFREQUENCY = defaultdict(int)
+
+def probChoice(choices, probabilities):
+    total = sum(probabilities)
+    prob_accumulator = 0
+    accumulator = []
+    for p in probabilities:
+        prob_accumulator += p
+        accumulator.append(prob_accumulator)
+    r = randrange(total)
+    bsct = bisect(accumulator, r)
+    chc = choices[bsct]
+    return chc
+
+def checkWinner(a, b):
+    if b == WHATBEATS[a]:
+        return b
+    elif a == WHATBEATS[b]:
+        return a
+
+    return None
+
+def sanitizeChoice(a):
+    # Drop it to lower-case
+    return a.lower()
+
+def registerPlayerChoice(choice):
+    CHOICEFREQUENCY[choice] += 1
+
+def getRandomChoice():
+    if len(CHOICEFREQUENCY) == 0:
+        return choice(ORDER)
+    choices = CHOICEFREQUENCY.keys()
+    probabilities = CHOICEFREQUENCY.values()
+    return WHATBEATS[probChoice(choices, probabilities)]
+
+while True:
+    humanChoice = raw_input()
+    humanChoice = sanitizeChoice(humanChoice)
+    if humanChoice not in ORDER:
+        continue
+
+    compChoice = getRandomChoice()
+    print "Computer picked", compChoice+",",
+
+    # Don't register the player choice until after the computer has made
+    # its choice.
+    registerPlayerChoice(humanChoice)
+
+    winner = checkWinner(humanChoice, compChoice)
+
+    if winner == None:
+        winner = "nobody"
+
+    print winner, "wins!"