please see the code
#tic-toc-toe game
#global constants
X="X"
O="O"
EMPTY=""
TIE="TIE"
NUM_SQUARES=9
def display_instruction():
print("tic-tac-toe game position:--\n"\
"0 | 1 | 2\n"\
"-----------\n"\
"3 | 4 | 5\n"\
"-----------\n"\
"6 | 7 | 8\n")
def ask_yes_no(question):
#ask yea or no ques
response=None
while response not in ("y","n"):
response=input(question).lower()
return response
def ask_number(question,low,high):
response=None
while response in range(low,high):
response=eval(input(question))
return response
def pieces():
go_first=ask_yes_no("do you require the first move?(y/n):")
if go_first=="y":
print("\nthen take the first move.you will need it")
human=X
computer=O
else:
print("\nyour bravery will be yours undoing...i will go first")
computer=X
human=O
return computer,human
def new_board():
board=[]
for square in range (9):
board.append(EMPTY)
return board
def display_board(board):
print("\n\t",board[0],"|",board[1],"|",board[2])
print("\t","-----------")
print("\n\t",board[3],"|",board[4],"|",board[5])
print("\t","-----------")
print("\n\t",board[6],"|",board[7],"|",board[8])
def legal_moves(board):
moves=[]
for square in range(9):
if board[square]==EMPTY:
moves.append(square)
return moves
def winner(board):
row=[ ]
WAYS_TO_WIN=(
(0,1,2)
,(3,4,5)
,(6,7,8)
,(0,3,6)
,(1,4,7)
,(2,5,8)
,(0,4,8)
,(2,4,6))
for row in WAYS_TO_WIN:
if board[row[0]]==board[row[1]]==board[row[2]] != EMPTY:
winner=board[row[0]]
return winner
if EMPTY not in board:
return TIE
return None
def human_moves(board,human):
legal=legal_moves(board)
move=0
while move not in legal:
move=ask_number("where will you move?(0-8)",0,9)
if move not in legal:
print("\n that square is already taken,foolish human,choose another number\n")
print ("fine")
return move
def computer_move(board,computer,human):
board = board[:]
BEST_MOVES=(4,0,2,6,8,1,3,5,7)
print("i shall take square number")
for move in legal_moves(board):
board[move]=computer
if winner(board==computer):
print (move)
return move
for move in legal_moves(board):
board[move]=human
if winner(board)==human:
print(move)
return move
board[move]=EMPTY
for move in BEST_MOVES:
if move in legal_move(board):
print(move)
return move
def next_turn(turn):
if turn==X:
return O
else:
return X
def congrat_winner(the_winner,computer,human):
if the_winner!=TIE:
print(the_winner,"won\n")
else:
print("its a tie\n")
if the_winner==computer:
print("i m invncible")
if the_winner==human:
print("there's must be some mistake ")
if the_winner==TIE:
print("you must be lucky this time")
def main():
display_instruction()
go_first=ask_yes_no("do you require the first move?(y/n):")
if go_first=="y":
print("\nthen take the first move.you will need it")
human=X
computer=O
else:
print("\nyour bravery will be yours undoing...i will go first")
computer=X
human=O
turn =X
board=new_board()
display_board(board)
while not winner(board):
if turn==human:
move=human_moves(board,human)
board[move] = human
else:
move=computer_move(board,computer,human)
board[move] = computer
display_board(board)
turn=next_turn(turn)
the_winner=winner(board)
congrat_winner(the_winner,computer,human)
main()
input("\n\nPress the enter key to quit")
