PYTHON- This is a Tic Tac Toe game. All I have to do is implement the try..except clause for all the input. I haven't used this clause before, so if anyone could do the modifications needed in the code and implement the try..except clause wherever required.

import random

class TicTacToe:

def __init__(self):

# "board" is a list of 10 strings representing the board (ignore index 0)

self.board = [" "]*10

self.board[0]="#"

def drawBoard(self):

# This method prints out the board with current plays adjacent to a board with index.

print(' ' + self.board[7] + ' | ' + self.board[8] + ' | ' + self.board[9],' 7 | 8 | 9 ', sep='\t')

print('-----------','-----------', sep='\t')

print(' ' + self.board[4] + ' | ' + self.board[5] + ' | ' + self.board[6],' 4 | 5 | 6 ', sep='\t')

print('-----------','-----------', sep='\t')

print(' ' + self.board[1] + ' | ' + self.board[2] + ' | ' + self.board[3],' 1 | 2 | 3 ', sep='\t')

def boardFull(self):

# This method checks if the board is already full and returns True. Returns false otherwise

if " " in self.board:

return False

else:

return True

def cellIsEmpty(self, cell):

if cell==0 or cell>9:

return False

else:

return self.board[cell]==" "

def assignMove(self, cell,ch):

# assigns the cell of the board to the character ch

if cell<10 and cell>0:

self.board[cell]=turn

def whoWon(self):

# returns the symbol of the player who won if there is a winner, otherwise it returns an empty string.

if self.isWinner("x"):

return "x"

elif self.isWinner("o"):

return "o"

else:

return ""

def isWinner(self, ch):

# Given a player's letter, this method returns True if that player has won.

return ((self.board[7] == ch and self.board[8] == ch and self.board[9] == ch) or # across the top

(self.board[4] == ch and self.board[5] == ch and self.board[6] == ch) or # across the middle

(self.board[1] == ch and self.board[2] == ch and self.board[3] == ch) or # across the bottom

(self.board[7] == ch and self.board[4] == ch and self.board[1] == ch) or # down the left side

(self.board[8] == ch and self.board[5] == ch and self.board[2] == ch) or # down the middle

(self.board[9] == ch and self.board[6] == ch and self.board[3] == ch) or # down the right side

(self.board[7] == ch and self.board[5] == ch and self.board[3] == ch) or # diagonal

(self.board[9] == ch and self.board[5] == ch and self.board[1] == ch)) # diagonal

def isWinnerIfPlay(self,ch,cell):

# Given a player's letter (ch) and a cell position (cell), this method returns True if that player would win had he played that position.

if cell<0 or cell> 9: # incorrect range

return False

if self.board[cell]!=" ": #the position can't be played

return False

cboard=[" "]*10 #copy the board into another one to be able to simulate the plyer at the new position

for i in range(0,10):

cboard[i]=self.board[i]

cboard[cell]=ch #palying the player ch at position cell

return ((cboard[7] == ch and cboard[8] == ch and cboard[9] == ch) or # across the top

(cboard[4] == ch and cboard[5] == ch and cboard[6] == ch) or # across the middle

(cboard[1] == ch and cboard[2] == ch and cboard[3] == ch) or # across the bottom

(cboard[7] == ch and cboard[4] == ch and cboard[1] == ch) or # down the left side

(cboard[8] == ch and cboard[5] == ch and cboard[2] == ch) or # down the middle

(cboard[9] == ch and cboard[6] == ch and cboard[3] == ch) or # down the right side

(cboard[7] == ch and cboard[5] == ch and cboard[3] == ch) or # diagonal

(cboard[9] == ch and cboard[5] == ch and cboard[1] == ch)) # diagonal

def ComputerPlaysDum(board):

for i in range(1,10):

if board.cellIsEmpty(i):

return str(i)

def ComputerPlaysRandom(board):

r=random.randint(1,9)

while not board.cellIsEmpty(r):

r=random.randint(1,9)

return str(r)

def ComputerPlaysSmart(board,turn):

# First, check if we can win in the next move

for i in range(1, 10):

if board.isWinnerIfPlay(turn,i):

return str(i)

if turn=='x': #check the letter of the player (turn is computer)

player='o'

else:

player="x"

# Check if the player could win on his next move, and block them.

for i in range(1, 10):

if board.isWinnerIfPlay(player,i):

return str(i)

# Try to take the center, if it is free.

if board.cellIsEmpty(5):

return "5"

# Try to take one of the corners, if they are free.

corners=""

if board.cellIsEmpty(1):

corners+="1"

if board.cellIsEmpty(3):

corners+="3"

if board.cellIsEmpty(7):

corners+="7"

if board.cellIsEmpty(9):

corners+="9"

if corners!="":

return random.choice(corners)

# Move on one of the sides.

corners=""

if board.cellIsEmpty(2):

corners+="2"

if board.cellIsEmpty(4):

corners+="4"

if board.cellIsEmpty(6):

corners+="6"

if board.cellIsEmpty(8):

corners+="8"

if corners!="":

return random.choice(corners)

print ("Welcome to Tic Tac Toe Series")

myLoop=True

while myLoop:

print ("User against user ...............1")

print ("User against dumb computer ......2")

print ("User against random computer ....3")

print ("User against smart computer......4")

print ("Quit ............................5")

game=""

while game not in "1 2 3 4 5".split():

game=input("Enter your choice ")

if game=="5":

myLoop=False

elif game=="1":

myBoard=TicTacToe()

gameIsOn=True

turn="x"

while gameIsOn:

myBoard.drawBoard()

print ("It is the turn for", turn,". ",end="")

move="0"

while not myBoard.cellIsEmpty(int(move)):

move="0"

while move not in "1 2 3 4 5 6 7 8 9".split():

move=input("what is your move?")

if not myBoard.cellIsEmpty(int(move)):

print (move,"is not available. ",end='')

move="0"

myBoard.assignMove(int(move),turn)

winner=myBoard.whoWon()

if winner!='':

myBoard.drawBoard()

print (turn,"wins. Congrats!")

input("Press Enter to continue")

gameIsOn=False

elif myBoard.boardFull():

myBoard.drawBoard()

print ("It's a tie.")

input("Press Enter to continue")

gameIsOn=False

elif turn=="x":

turn="o"

else:

turn="x"

elif game=="2":

myBoard=TicTacToe()

gameIsOn=True

myTurn="."

while myTurn not in "o x".split():

myTurn=input("Do you want to play x or o?")

myTurn=myTurn.lower()

turn="x"

while gameIsOn:

myBoard.drawBoard()

if turn==myTurn:

print ("It is the turn for", turn,". ",end="")

move="0"

while not myBoard.cellIsEmpty(int(move)):

move="0"

while move not in "1 2 3 4 5 6 7 8 9".split():

move=input("What is your move?")

if not myBoard.cellIsEmpty(int(move)):

print (move,"is not available. ",end='')

move="0"

else:

print ("Computer's turn.",end="")

move=ComputerPlaysDum(myBoard)

print (" Played",move)

myBoard.assignMove(int(move),turn)

winner=myBoard.whoWon()

if winner!='':

drawBoard(myBoard)

if turn==myTurn:

print (turn,"wins. Congrats!")

else:

print ("Computer wins.")

input("Press Enter to continue")

gameIsOn=False

elif myBoard.boardFull():

drawBoard(myBoard)

print ("It's a tie.")

input("Press Enter to continue")

gameIsOn=False

elif turn=="x":

turn="o"

else:

turn="x"

elif game=="3":

myBoard=TicTacToe()

gameIsOn=True

myTurn="."

while myTurn not in "o x".split():

myTurn=input("Do you want to play x or o?")

myTurn=myTurn.lower()

turn="x"

while gameIsOn:

myBoard.drawBoard()

if turn==myTurn:

print ("It is the turn for", turn,". ",end="")

move="0"

while not myBoard.cellIsEmpty(int(move)):

move="0"

while move not in "1 2 3 4 5 6 7 8 9".split():

move=input("What is your move?")

if not myBoard.cellIsEmpty(int(move)):

print (move,"is not available. ",end='')

move="0"

else:

print ("Computer's turn.",end="")

move=ComputerPlaysRandom(myBoard)

print (" Played",move)

myBoard.assignMove(int(move),turn)

winner=myBoard.whoWon()

if winner!='':

myBoard.drawBoard()

if turn==myTurn:

print (turn,"wins. Congrats!")

else:

print ("Computer wins.")

input("Press Enter to continue")

gameIsOn=False

elif myBoard.boardFull():

myBoard.drawBoard()

print ("It's a tie.")

input("Press Enter to continue")

gameIsOn=False

elif turn=="x":

turn="o"

else:

turn="x"

elif game=="4":

myBoard=TicTacToe()

gameIsOn=True

myTurn="."

while myTurn not in "o x".split():

myTurn=input("Do you want to play x or o?")

myTurn=myTurn.lower()

turn="x"

while gameIsOn:

myBoard.drawBoard()

if turn==myTurn:

print ("It is the turn for", turn,". ",end="")

move="0"

while not myBoard.cellIsEmpty(int(move)):

move="0"

while move not in "1 2 3 4 5 6 7 8 9".split():

move=input("What is your move?")

if not myBoard.cellIsEmpty(int(move)):

print (move,"is not available. ",end='')

move="0"

else:

print ("Computer's turn.",end="")

move=ComputerPlaysSmart(myBoard,turn)

print (" Played",move)

myBoard.assignMove(int(move),turn)

winner=myBoard.whoWon()

if winner!='':

myBoard.drawBoard()

if turn==myTurn:

print (turn,"wins. Congrats!")

else:

print ("Computer wins.")

input("Press Enter to continue")

gameIsOn=False

elif myBoard.boardFull():

myBoard.drawBoard()

print ("It's a tie.")

input("Press Enter to continue")

gameIsOn=False

elif turn=="x":

turn="o"

else:

turn="x"