#全局变量
X = "X"
O = "O"
EMPTY = " "
TIE = "TIE"
NUM_SQUARES = 9
def display_instruct():
"""Display game instruction."""
print("""
Welcome to the greatest intellectual challenge of all time:Tic-Tac-Toe.
This will be a showdown between your human brain and my silicon processor.
You will make your move known by entering a number 0-8,The number
will correspond to the board position as illustrate:
0 | 1 | 2 |
-----------
3 | 4 | 5 |
-----------
6 | 7 | 8 |
Prepare yourself,human.The ultimate battle is about tobegin.\n
""")
def ask_yes_no(question):
"""Ask a yes or no question"""
response = None
while response not in ("y","n"):
response = input(question).lower()
return response
def ask_number(question,low,high):
"""Ask for a nummber within a range."""
response = None
while response not in range(low,high):
response = int(input(question))
return response
def pieces():
"""Determine if player or comuputer goes first."""
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 your undoing...I wil go first.")
computer = X
human = O
return computer,human
def new_board():
"""Create new game board."""
board = []
for square in range(NUM_SQUARES):
board.append(EMPTY)
return board
def display_board(board):
"""Display game board on screen."""
print("\n\t",board[0],"|",board[1],"|",board[2])
print("\t","----------")
print("\t",board[3],"|",board[4],"|",board[5])
print("\t","----------")
print("\t",board[6],"|",board[7],"|",board[8],"\n")
def legal_move(board):
"""Create list of legal moves."""
moves = []
for square in range(NUM_SQUARES):
if board[square] == EMPTY:
moves.append(square)
return moves
def winner(board):
"""Detemine the game winner."""
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_move(board,human):
"""Get human move."""
legal = legal_move(board)
move = None
while move not in legal:
move = ask_number("Where will you move?(0-8):",0,NUM_SQUARES)
if move not in legal:
print("\nThat square is already occupied.foolish human.Choose another.\n")
print("Fine...")
return move
def computer_move(board,computer,human):
"""Make computer move."""
board = board[:]
BEST_MOVES = (4,0,2,6,8,1,3,5,7)
print("I shall take square number",end=" ")
for move in legal_move(board):
board[move] = computer
if winner(board) == computer:
print(move)
return move
board[move] = EMPTY
for move in legal_move(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):
"""Switch turns."""
if turn == X:
return O
else:
return X
def congra_winner(the_winner,computer,human):
"""Congratulate the winner."""
if the_winner != TIE:
print(the_winner,"won!\n")
else:
print("It's a tie!\n")
if the_winner == computer:
print("As I predicted,human,I am triumphant once more.\n")
elif the_winner == human:
print("NO,no! It cannot be!Somehow you tricked me,human.\n")
elif the_winner == TIE:
print("You were most lucky,human,and somehow managed to tie me.\n")
def main():
display_instruct()
computer,human = pieces()
turn = X
board = new_board()
display_board(board)
while not winner(board):
if turn == human:
move = human_move(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)
congra_winner(the_winner,computer,human)
main()
Welcome to the greatest intellectual challenge of all time:Tic-Tac-Toe.
This will be a showdown between your human brain and my silicon processor.
You will make your move known by entering a number 0-8,The number
will correspond to the board position as illustrate:
0 | 1 | 2 |
-----------
3 | 4 | 5 |
-----------
6 | 7 | 8 |
Prepare yourself,human.The ultimate battle is about tobegin.
Do you require the first move?(y/n):n
Your bravery will be your undoing...I wil go first.
| |
----------
| |
----------
| |
I shall take square number 4
| |
----------
| X |
----------
| |
Where will you move?(0-8):0
Fine...
O | |
----------
| X |
----------
| |
I shall take square number 2
O | | X
----------
| X |
----------
| |
Where will you move?(0-8):6
Fine...
O | | X
----------
| X |
----------
O | |
I shall take square number 3
O | | X
----------
X | X |
----------
O | |
Where will you move?(0-8):5
Fine...
O | | X
----------
X | X | O
----------
O | |
I shall take square number 8
O | | X
----------
X | X | O
----------
O | | X
Where will you move?(0-8):1
Fine...
O | O | X
----------
X | X | O
----------
O | | X
I shall take square number 7
O | O | X
----------
X | X | O
----------
O | X | X
It's a tie!
You were most lucky,human,and somehow managed to tie me.
