# 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:

```python
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:

```python
import random

human = input("Your choice? ")

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.")
```


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