Tic-Tac-Toe

Tic-Tac-Toe_game.py

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+# --------- Global Variables -----------
+
+# Will hold our game board data
+board = ["-", "-", "-",
+         "-", "-", "-",
+         "-", "-", "-"]
+
+# Lets us know if the game is over yet
+game_still_going = True
+
+# Tells us who the winner is
+winner = None
+
+# Tells us who the current player is (X goes first)
+current_player = "X"
+
+
+# ------------- Functions ---------------
+
+# Play a game of tic tac toe
+def play_game():
+
+  # Show the initial game board
+  display_board()
+
+  # Loop until the game stops (winner or tie)
+  while game_still_going:
+
+    # Handle a turn
+    handle_turn(current_player)
+
+    # Check if the game is over
+    check_if_game_over()
+
+    # Flip to the other player
+    flip_player()
+
+  # Since the game is over, print the winner or tie
+  if winner == "X" or winner == "O":
+    print(winner + " won.")
+  elif winner == None:
+    print("Tie.")
+
+
+# Display the game board to the screen
+def display_board():
+  print("\n")
+  print(board[0] + " | " + board[1] + " | " + board[2] + "     1 | 2 | 3")
+  print(board[3] + " | " + board[4] + " | " + board[5] + "     4 | 5 | 6")
+  print(board[6] + " | " + board[7] + " | " + board[8] + "     7 | 8 | 9")
+  print("\n")
+
+
+# Handle a turn for an arbitrary player
+def handle_turn(player):
+
+  # Get position from player
+  print(player + "'s turn.")
+  position = input("Choose a position from 1-9: ")
+
+  # Whatever the user inputs, make sure it is a valid input, and the spot is open
+  valid = False
+  while not valid:
+
+    # Make sure the input is valid
+    while position not in ["1", "2", "3", "4", "5", "6", "7", "8", "9"]:
+      position = input("Choose a position from 1-9: ")
+
+    # Get correct index in our board list
+    position = int(position) - 1
+
+    # Then also make sure the spot is available on the board
+    if board[position] == "-":
+      valid = True
+    else:
+      print("You can't go there. Go again.")
+
+  # Put the game piece on the board
+  board[position] = player
+
+  # Show the game board
+  display_board()
+
+
+# Check if the game is over
+def check_if_game_over():
+  check_for_winner()
+  check_for_tie()
+
+
+# Check to see if somebody has won
+def check_for_winner():
+  # Set global variables
+  global winner
+  # Check if there was a winner anywhere
+  row_winner = check_rows()
+  column_winner = check_columns()
+  diagonal_winner = check_diagonals()
+  # Get the winner
+  if row_winner:
+    winner = row_winner
+  elif column_winner:
+    winner = column_winner
+  elif diagonal_winner:
+    winner = diagonal_winner
+  else:
+    winner = None
+
+
+# Check the rows for a win
+def check_rows():
+  # Set global variables
+  global game_still_going
+  # Check if any of the rows have all the same value (and is not empty)
+  row_1 = board[0] == board[1] == board[2] != "-"
+  row_2 = board[3] == board[4] == board[5] != "-"
+  row_3 = board[6] == board[7] == board[8] != "-"
+  # If any row does have a match, flag that there is a win
+  if row_1 or row_2 or row_3:
+    game_still_going = False
+  # Return the winner
+  if row_1:
+    return board[0] 
+  elif row_2:
+    return board[3] 
+  elif row_3:
+    return board[6] 
+  # Or return None if there was no winner
+  else:
+    return None
+
+
+# Check the columns for a win
+def check_columns():
+  # Set global variables
+  global game_still_going
+  # Check if any of the columns have all the same value (and is not empty)
+  column_1 = board[0] == board[3] == board[6] != "-"
+  column_2 = board[1] == board[4] == board[7] != "-"
+  column_3 = board[2] == board[5] == board[8] != "-"
+  # If any row does have a match, flag that there is a win
+  if column_1 or column_2 or column_3:
+    game_still_going = False
+  # Return the winner
+  if column_1:
+    return board[0] 
+  elif column_2:
+    return board[1] 
+  elif column_3:
+    return board[2] 
+  # Or return None if there was no winner
+  else:
+    return None
+
+
+# Check the diagonals for a win
+def check_diagonals():
+  # Set global variables
+  global game_still_going
+  # Check if any of the columns have all the same value (and is not empty)
+  diagonal_1 = board[0] == board[4] == board[8] != "-"
+  diagonal_2 = board[2] == board[4] == board[6] != "-"
+  # If any row does have a match, flag that there is a win
+  if diagonal_1 or diagonal_2:
+    game_still_going = False
+  # Return the winner
+  if diagonal_1:
+    return board[0] 
+  elif diagonal_2:
+    return board[2]
+  # Or return None if there was no winner
+  else:
+    return None
+
+
+# Check if there is a tie
+def check_for_tie():
+  # Set global variables
+  global game_still_going
+  # If board is full
+  if "-" not in board:
+    game_still_going = False
+    return True
+  # Else there is no tie
+  else:
+    return False
+
+
+# Flip the current player from X to O, or O to X
+def flip_player():
+  # Global variables we need
+  global current_player
+  # If the current player was X, make it O
+  if current_player == "X":
+    current_player = "O"
+  # Or if the current player was O, make it X
+  elif current_player == "O":
+    current_player = "X"
+
+
+# ------------ Start Execution -------------
+# Play a game of tic tac toe
+play_game()