The master

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

Source code:

import random
#PC=input()
if input=="":
    #bfs_dfs=random(0,1)
    play=random.choice(["R","P","S"])
else:
    prev=input
    bfs_dfs=0
    repeat=0
    play="x"
    #print prev
    if repeat>0:
        repeat-=1
    else:
        if prev=="R":
            play="S"
        elif prev=="P":
            play="R"
        elif prev=="S":
            play= "P"
output=play