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tictactoe.py
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tictactoe.py
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"""Tic-Tac-Toe is played by two players on a 3*3 matrix.
One player is X and the other is O. Players take turns
placing Xs and Os on the matrix. If a player marks 3 spaces
either in a row, column or diagonal, they win. Otherwise,
the game ends in a draw.
-+-+-
X|O|X
-+-+-
O|X|O
-+-+-
X|O|X
-+-+-
"""
import re
import random
import time
def draw_board(board: list[str]):
"""prints out board with moves from the passed list"""
print("+-+-+-+")
print("|" + board[0] + "|" + board[1] + "|" + board[2] + "|")
print("+-+-+-+")
print("|" + board[3] + "|" + board[4] + "|" + board[5] + "|")
print("+-+-+-+")
print("|" + board[6] + "|" + board[7] + "|" + board[8] + "|")
print("+-+-+-+")
print()
def player_chooses_mark() -> tuple[str, str]:
"""returns letters for player and computer"""
player_letter = ""
while player_letter != "X" and player_letter != "O":
print("Choose X or O")
player_letter = input().upper()
computer_letter = "X" if player_letter == "O" else "O"
return (player_letter, computer_letter)
def check_for_win(current_play: list[str]) -> tuple[bool, str]:
"""checks the current play for any winner and returns tuple of
True/False and the winner"""
Xs = []
Os = []
for index, val in enumerate(current_play):
if val == "X":
Xs.append(index)
elif val == "O":
Os.append(index)
else:
pass
wins = [
[0, 1, 2], # row 0
[3, 4, 5], # row 1
[6, 7, 8], # row 2
[0, 3, 6], # column 0
[1, 4, 7], # column 1
[2, 5, 8], # column 2
[0, 4, 8], # diagonal 0
[2, 4, 6], # diagonal 1
]
for element in wins:
if all(value in Xs for value in element):
return (True, "X")
elif all(value in Os for value in element):
return (True, "O")
else:
pass
else:
return (False, "None")
def get_player_move(player_mark: str, current_play: list[str]) -> list[str]:
"""receives list of already made moves, asks player for new move, and returns
a new list with the new move"""
player_move = ""
while (
re.match("^[1-9]$", player_move) is None
or current_play[int(player_move) - 1] != " "
):
print("Choose where to mark. (1~9)")
player_move = input()
new_play = current_play.copy()
new_play[int(player_move) - 1] = player_mark
return new_play
def get_computer_move(computer_mark: str, current_play: list[str]) -> list[str]:
"""the computer's AI algorithm for playing"""
empty_spaces = [index for index, val in enumerate(current_play) if val == " "]
new_play = current_play.copy()
# 1. make winning move
for move in empty_spaces:
new_play[move] = computer_mark
if check_for_win(new_play)[0]:
return new_play
else:
new_play[move] = " "
# 2. block opponent's winning move
for move in empty_spaces:
new_play[move] = "X" if computer_mark == "O" else "O"
if check_for_win(new_play)[0]:
new_play[move] = computer_mark
return new_play
else:
new_play[move] = " "
# 3. take one of the corners
corners = [0, 2, 6, 8]
for move in corners:
if move in empty_spaces:
new_play[move] = computer_mark
return new_play
# 4. take the center
if 4 in empty_spaces:
new_play[4] = computer_mark
return new_play
# 5. take any of the remaining spots
new_play[random.choice(empty_spaces)] = computer_mark
return new_play
if __name__ == "__main__":
print("T I C - T A C - T O E")
print()
time.sleep(2)
print("Coordinates for the board:")
numbered = ["1", "2", "3", "4", "5", "6", "7", "8", "9"]
draw_board(numbered)
time.sleep(2)
print("Let's begin.")
empty = [" " for _ in numbered]
draw_board(empty)
player, computer = player_chooses_mark()
ongoing_play = empty.copy()
while True:
# player makes a move
ongoing_play = get_player_move(player, ongoing_play)
draw_board(ongoing_play)
# check if player won
if check_for_win(ongoing_play)[0]:
break
# check if board is empty
if not any(pos == " " for pos in ongoing_play):
break
# computer makes a move
ongoing_play = get_computer_move(computer, ongoing_play)
draw_board(ongoing_play)
# check if computer won
if check_for_win(ongoing_play)[0]:
break
# post results
print(check_for_win(ongoing_play)[1] + " wins")