# Tictactoe.py

Sep 23rd, 2021
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1. def switch_turn(turn):
2.     if turn == "X":
3.         return "O"
4.     else:
5.         return "X"
6.
7. def printboard(board):
8.     print()
9.     print(board[1] + " | " + board[2] + " | " +board[3])
10.     print("- + - + -")
11.     print(board[4] + " | " + board[5] + " | " +board[6])
12.     print("- + - + -")
13.     print(board[7] + " | " + board[8] + " | " +board[9])
14.     print()
15.
16. def get_input(turn, board):
17.     while True:
18.         print(turn + "'s turn")
19.         position = input("Enter the position you want to play: ")
20.
21.         if not position.isdigit(): # what if user enters something that is not a number?
22.             print("Please enter a number. ")
23.         elif not 1 <= int(position) <= 9:
24.             print("Enter a number in the valid range.")
25.         elif not board[int(position)].isdigit():
27.         else:
28.
29.             return int(position)
30.
31. def checkwin(board):
32.     if board[1] == board[2] == board[3]:
33.         return True, board[3]
34.     elif board[4] == board[5] == board[6]:
35.         return True, board[6]
36.     elif board[7] == board[8] == board[9]:
37.         return True, board[9]
38.     elif board[1] == board[4] == board[7]:
39.         return True, board[7]
40.     elif board[2] == board[5] == board[8]:
41.         return True, board[5]
42.     elif board[3] == board[6] == board[9]:
43.         return True, board[9]
44.     elif board[1] == board[5] == board[9]:
45.         return True, board[9]
46.     elif board[3] == board[5] == board[7]:
47.         return True, board[7]
48.     else:
49.         return False, None
50.
51.
52.
53. def main():
54.     turn = "X"
55.     board = ["0", "1","2", "3","4", "5","6", "7","8", "9"]
56.     printboard(board)
57.     game_over = False
58.     count = 0
59.     while not game_over and count < 9:
60.         position = get_input(turn, board)
61.         count += 1
62.         board[position] = turn
63.         printboard(board)
64.         game_over, winner = checkwin(board)
65.         turn = switch_turn(turn)
66.
67.     print(winner, "won the game")
68.
69. main()