bestAgainDefault4

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

Source code:

import random

def beating(symb):
    return {
        "R": "P",
        "P": "S",
        "S": "R"
    }.get(symb)



if input == "": # initialize variables for the first round
    countOpp = {
        "R": 0,
        "P": 0,
        "S": 0
    }

    countMe = {
        "R": 0,
        "P": 0,
        "S": 0
    }
else:
    countOpp[input] += 1

if input == "":
    output = random.choice(["R","P","S"])
else:
    sortedItems = sorted(countMe.items(), key=lambda x:-x[1])
    allBests = list(filter(lambda x: x[1] == sortedItems[0][1], sortedItems))
    best = random.choice(allBests)[0]
    output = beating(beating(best))

countMe[output] += 1