dedekind_2

Use rpsrunner.py to play unranked matches on your computer.

Source code:

import random
import bisect

def weighted_choice_b(weights):
    totals = []
    running_total = 0

    for w in weights:
        running_total += w
        totals.append(running_total)

    rnd = random.random() * running_total
    return bisect.bisect_right(totals, rnd)

if input == "":
    opponentPicks = [0,0,0]
    totalOpPicks = 0
    opponentPicksWeights = [0,0,0]
    pickWeights = [0,0,0]
    picks = ["R","P","S"]
    output = random.choice(picks)
elif (input == "R"):
    opponentPicks[0] += 1
elif (input == "P"):
    opponentPicks[1] += 1
else:
    opponentPicks[2] += 1

totalOpPicks += 1

i = 0
for pick in opponentPicks:
    opponentPicksWeights[i] = (pick/float(totalOpPicks))
    i += 1

pickWeights[0] = opponentPicksWeights[2]
pickWeights[1] = opponentPicksWeights[0]
pickWeights[2] = opponentPicksWeights[1]

choise = weighted_choice_b(pickWeights)
if choise > 2:
    choise -= 1
output = picks[choise]