# 6. Exercise: Paper, Scissors, Stone game

Let's use what we have learn so far to build a simple game: Paper, Scissors, Stone.
First, we want to map out the logic of the game, which will help us build a series of `if...elsif...` statements. There can only be finite number of results, as shown below:
 Human (you) Computer Result Paper Scissors You lose Paper Stone You win Paper Paper Draw Scissors Paper You win Scissors Stone You lose Scissors Scissors Draw Stone Scissors You win Stone Paper You lose Stone Stone Draw
Now, we are ready to capture the above logic into a series of` if...elsif...` statements:
if human== "paper" and computer == "scissors":
print("You lose")
elif human== "paper" and computer == "stone":
print("You win")
elif human== "paper" and computer == "paper":
print("Draw")
elif human== "scissors" and computer == "paper":
print("You win")
elif human== "scissors" and computer == "stone":
print("You lose")
elif human== "scissors" and computer == "scissors":
print("Draw")
elif human== "stone" and computer == "scissors":
print("You win")
elif human== "stone" and computer == "paper":
print("You lose")
elif human== "stone" and computer == "stone":
print("Draw")
You can also add a user input using `input()` function, randomized the computer choice using `random.randin()` function, as well as adding an `else` "end all" condition to improve the game:
import random
comp = random.randint(1,3)
if comp==1:
computer = "paper"
elif comp==2:
computer = "scissors"
elif comp==3:
computer = "stone"
print("Computer choice: " + computer)
if human== "paper" and computer == "scissors":
print("You lose")
elif human== "paper" and computer == "stone":
print("You win")
elif human== "paper" and computer == "paper":
print("Draw")
elif human== "scissors" and computer == "paper":
print("You win")
elif human== "scissors" and computer == "stone":
print("You lose")
elif human== "scissors" and computer == "scissors":
print("Draw")
elif human== "stone" and computer == "scissors":
print("You win")
elif human== "stone" and computer == "paper":
print("You lose")
elif human== "stone" and computer == "stone":
print("Draw")
else:
print("Invalid input.")