# Tic tac toe

This a problem set for you to work through [1]

This is a problem set. Some of these are easy, others are far more difficult. The purpose of these problems sets are:

1. to build your skill applying computational thinking to a problem
2. to assess your knowledge and skills of different programming practices

## What is this problem set trying to do

This problem set is testing your computational thinking, your skill and understanding of lists, and your skill and understanding of loops

## The Problem

Your program must do three things:

1. it must allow a human to play against a computer a game of tic tac toe
1. your program must have win and lose conditions
2. it must drawRepresent by means of a labelled, accurate diagram or graph, using a pencil. A ruler (straight edge) should be used for straight lines. Diagrams should be drawn to scale. Graphs should have points correctly plotted (if appropriate) and joined in a straight line or smooth curve. a tic tac to board, updated with x's and O's as the computer and human play.
3. It must follow the rules of tic tac toe

## Hacker edition

In the hacker version:

• Your program should be good at playing tic tac toe
```import random

# initialization stuff here:

board = [1,2,3,4,5,6,7,8,9]
computerSpaces = []
humanSpaces =[1]
game = 0

def drawPieces(position):
if position in humanSpaces:
return "X"
elif position in computerSpaces:
return "O"
else:
return position

# this function draws the board
def drawBoard():
print("")
print("")
print(" ",drawPieces(1),"  |   (2)    | (3) ")
print("     |          |     ")
print("----------------------")
print(" (4) |   (5)    | (6) ")
print("     |          |     ")
print("----------------------")
print(" (7) |   (8)    | (9) ")
print("     |          |     ")

return

# this function manages player moves
def playerMove(move):
return

# this function manages computer moves
def computerMove(computerMove):
return

while True:
print(drawBoard())
move=input("Please choose a move (99 to quit): ")
if move == "99":
break
elif str(move) in computerSpaces or str(move) in humanSpaces:
print("this is a invalid move")
else:
humanSpaces.append(move)
print(humanSpaces)
# playerMove(move)
```

## How you will be assessed

Scope

• To what extentConsider the merits or otherwise of an argument or concept. Opinions and conclusions should be presented clearly and supported with appropriate evidence and sound argument. does your code implement the features required by our specification?
• To what extentConsider the merits or otherwise of an argument or concept. Opinions and conclusions should be presented clearly and supported with appropriate evidence and sound argument. is there evidence of effort?

Correctness

• To what extentConsider the merits or otherwise of an argument or concept. Opinions and conclusions should be presented clearly and supported with appropriate evidence and sound argument. did your code meet specifications?
• To what extentConsider the merits or otherwise of an argument or concept. Opinions and conclusions should be presented clearly and supported with appropriate evidence and sound argument. did your code meet unit tests?
• To what extentConsider the merits or otherwise of an argument or concept. Opinions and conclusions should be presented clearly and supported with appropriate evidence and sound argument. is your code free of bugs?

DesignProduce a plan, simulation or model.

• To what extentConsider the merits or otherwise of an argument or concept. Opinions and conclusions should be presented clearly and supported with appropriate evidence and sound argument. is your code written well (i.e. clearly, efficiently, elegantly, and/or logically)?
• To what extentConsider the merits or otherwise of an argument or concept. Opinions and conclusions should be presented clearly and supported with appropriate evidence and sound argument. is your code eliminating repetition?
• To what extentConsider the merits or otherwise of an argument or concept. Opinions and conclusions should be presented clearly and supported with appropriate evidence and sound argument. is your code using functions appropriately?

Style

• To what extentConsider the merits or otherwise of an argument or concept. Opinions and conclusions should be presented clearly and supported with appropriate evidence and sound argument. is your code readable?
• To what extentConsider the merits or otherwise of an argument or concept. Opinions and conclusions should be presented clearly and supported with appropriate evidence and sound argument. is your code commented?
• To what extentConsider the merits or otherwise of an argument or concept. Opinions and conclusions should be presented clearly and supported with appropriate evidence and sound argument. are your variables well named?
• To what extentConsider the merits or otherwise of an argument or concept. Opinions and conclusions should be presented clearly and supported with appropriate evidence and sound argument. do you adhere to style guide?

## A possible solution

Click the expand link to see one possible solution, but NOT before you have tried and failed!

```import random

# initialization stuff here:

board = [1,2,3,4,5,6,7,8,9]
computerSpaces = []
humanSpaces =[]
game = 0

# this function draws pieces on the board.
def drawPieces(position):
if position in humanSpaces:
return "X"
elif position in computerSpaces:
return "O"
else:
return position

# this function manages player moves
def playerMove(move):
humanSpaces.append(move)
humanSpaces.sort()
board.remove(int(move))
return

# this function manages computer moves
def computerMove():
# we choose a possible move from any moves left in the list board
move=random.choice(board)
# we append the move we just made into a list
computerSpaces.append(str(move))
# we sort the list because our win conditions are in a certain order. 1,2,3 is a win, but 3,2,1 isn't.
# sorting is a bit of a hack (there might be a better way to test for membership in a list iregardless of order)
computerSpaces.sort()
# finally, we remove the place from our list keeping track of the places.
board.remove(move)
return

# this function draws the board
def drawBoard():
print("")
print("")
print(" ",drawPieces('1'),"  |   ",drawPieces('2'),"    | ",drawPieces('3'), "  ")
print("      |          |     ")
print("----------------------")
print(" ",drawPieces('4'),"  |   ",drawPieces('5'),"    | ",drawPieces('6'), "  ")
print("      |          |     ")
print("----------------------")
print(" ",drawPieces('7'),"  |   ",drawPieces('8'),"    | ",drawPieces('9'), "  ")
print("      |          |     ")
return

# this functions looks for win win conditions
def winConditions():
winConditions = [['1','2','3'],['4','5','6'],['7','8','9'],['1','5','9'],['3','5','7'],['1','4','7'],['2','5','8'],['3','6','9']]
if any(humanSpaces) in winConditions:
print("human won")
raise SystemExit
elif any(computerSpaces) in winConditions:
print("commputer won")
raise SystemExit
return

# main game loop
while True:
print(board)
print(drawBoard())
move=input("Please choose a move (99 to quit): ")
if move == "99":
break
elif str(move) in computerSpaces or str(move) in humanSpaces:
print("this is a invalid move")
else:
playerMove(move)
computerMove()
winConditions()
print(humanSpaces)
print(computerSpaces)
# playerMove(move)
```