[英]IndexErrors in Tic-Tac-Toe program I'm having issues with
I've pasted the code here:
X = "X"
O = "O"
board = []
EMPTY = ""
def instructions_prompt ():
print "\t\t\tNoughts and Crosses"
print \
"""Foolish human. Now that you've entered this Python program,
there is no exit. None! (At any point in the game if you feel
like you are intimidated by my presence, hit 0 to exit)
This challenge of wits will be one of many failures in your life.
The instructions are as follows:
1. Select a number from the following key:
0 | 1 | 2
---------
3 | 4 | 5
---------
6 | 7 | 8
to place X or O which is predetermined by whether or not you start
the game.
2. Try to save face while failing. And don't talk about Fight Club."""
def start_prompt ():
choice = raw_input ("Would you like to go first (Y/N)?")
lower = choice.lower()
if lower == "y":
human = X
computer = O
print "You're",human
print "I am",computer
elif lower == "n":
computer = X
human = O
print "You're",human
print "I'm in",computer
return human, computer
def display_board (board):
print "",board[0],"|",board[1],"|",board[2],""
print "---------"
print "",board[3],"|",board[4],"|",board[5],""
print "---------"
print "",board[6],"|",board[7],"|",board[8],""
def turn_switcher (turn):
if turn == X:
return O
else:
return X
def fresh_board ():
for i in range (9):
board.append (EMPTY)
return board
def request_move ():
try:
square = int(raw_input("Where'd you like your square to be?"))
if square>8 or square<0:
print "This program can't proceed as that number is not on the board."
else:
return square
except:
print "That's not a number on the board. This program can't proceed."
def legal_moves (board):
legal_moves = []
for i in range (9):
if board [i] == EMPTY:
legal_moves.append(i)
return legal_moves
def winner (board):
if board[0] == board [1] == board [2] != EMPTY:
winner = board [0]
return winner
elif board [0] == board [3] == board [6] != EMPTY:
winner = board [0]
return winner
elif board [0] == board [4] == board [8] != EMPTY:
winner = board [0]
return winner
elif board [1] == board [4] == board [7] != EMPTY:
winner = board [1]
return winner
elif board [2] == board [5] == board [8] != EMPTY:
winner = board [2]
return winner
elif board [2] == board [4] == board [6] != EMPTY:
winner = board [2]
return winner
elif board [6] == board [7] == board [8] != EMPTY:
winner = board [8]
return winner
elif EMPTY not in board:
return None
def human_move (board, square):
legal = legal_moves(board)
if square not in legal:
print "This is not a legal move"
sys.exit()
else:
return square
def computer_move (computer, board, human):
best = (4,0,8,2,6,1,3,5,7)
board = board [:]
legal = legal_moves(board)
for i in legal:
board[i] = computer
if winner(board) == computer:
return i
board = EMPTY
#Stopping human from winning
for i in legal_moves(board):
board [i] = human
if winner(board) == human:
return i
for i in best:
if i in legal_moves(board):
return i
def main ():
instructions_prompt ()
human, computer = start_prompt ()
turn = X
board = fresh_board()
request_move ()
display_board (board)
while not winner(board):
if turn == human:
square = request_move()
move = human_move (board, square)
board[move] = human
else:
move = computer_move(computer, board, human)
board[move] = computer
display_board(board)
turn = turn_switcher(turn)
main ()
raw_input ("Enter a key to end.")
追溯:
Traceback (most recent call last):
File "C:\Users\COMPAQ\Desktop\NoughtsCrosses.py", line 152, in <module>
main ()
File "C:\Users\COMPAQ\Desktop\NoughtsCrosses.py", line 147, in main
move = computer_move(computer, board, human)
File "C:\Users\COMPAQ\Desktop\NoughtsCrosses.py", line 118, in computer_move
board[i] = computer
TypeError: 'str' object does not support item assignment
您對函數computer_move
參數感到困惑。 在第113行上,參數按順序為computer
, board
, human
。 但是,在第147行中,調用computer_move
的順序是board
, computer
, human
。
Python給您帶來了令人困惑的索引錯誤,因為Python字符串實際上只是字符列表。 例如
>>> "foo"[2] == "o"
True
更新:由於computer_move
的最后一行,您遇到了這個新錯誤。 應該是board[i] = EMPTY
而不是board = EMPTY
。
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