Python TIC TAC TOE Tutorial | Beginner Friendly Tutorial

Tic tac toe tutorial in python. Hey everyone! In today's video I showcase an ultra-beginner friendly project all beginners should try. We reinforce many beginner skills and end up with a great product! As I said in the video, linked below is the source code:

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[Fresco]

board = ['-', '-', '-',
'-', '-', '-',
'-', '-', '-']
currentPlayer = "X"
winner = None
gameRunning = True

#printing board

def printBoard(board):
print(board[0] + " | " + board[1] + " | " + board[2])
print("-" * 9)
print(board[3] + " | " + board[4] + " | " + board[5])
print("-" * 9)
print(board[6] + " | " + board[7] + " | " + board[8])

#take player input
def playerInput(board):
while True:
if currentPlayer == "X":
inp = int(input(f"Enter a number 1-9 \033[1;34m Player (X) \033[0;0m : "))
else:
inp = int(input(f"Enter a number 1-9 \033[1;31m Player (0) \033[0;0m : "))
if inp >= 1 and inp <= 9 and board[inp-1] == "-":
board[inp-1] = currentPlayer
break
else:
if currentPlayer == "X":
print(f"Oops! Try again! Player - \033[1;34m Player (X) \033[0;0m ! ")
else:
print(f"Oops! Try again! Player - \033[1;31m Player (0) \033[0;0m ! ")
printBoard(board)


#check for win or tie
def checkHorizontal(board):
global winner
if (board[0] == board[1] == board[2] and board[0] != "-") or (board[3] == board[4] == board[5] and board[3] != "-") or (board[6] == board[7] == board[8] and board[6] != "-"):
winner = currentPlayer
return True
def checkRow(board):
global winner
if (board[0] == board[3] == board[6] and board[0] != "-") or (board[1] == board[4] == board[7] and board[1] != "-") or (board[2] == board[5] == board[8] and board[2] != "-"):
winner = currentPlayer
return True
def checkDiagonal(board):
global winner
if (board[0] == board[4] == board[5] and board[0] != "-") or (board[2] == board[4] == board[6] and board[2] != "-"):
winner = currentPlayer
return True
def checkTie(board):
global gameRunning
if "-" not in board:
printBoard(board)
print("Its a tie")
gameRunning = False

def checkWin():
if checkDiagonal(board) or checkHorizontal(board) or checkRow(board):
print(f"The winner is {winner}")

#switch the player
def switchPlayer():
global currentPlayer
if currentPlayer == "X":
currentPlayer = "O"
else:
currentPlayer = "X"



#check for win or tie again

while gameRunning:
printBoard(board)
if winner != None:
break
playerInput(board)
checkWin()
checkTie(board)
switchPlayer()

[Yinyang]

after dealing with some hiccups throughout this tutorial. I noticed there were some indentation errors for me, but overall I got it to work in the end! Thank you for your tutorial as this was my first ever project and I am getting a grasp on the terminology.

[denisem]

You explained this better than how my professor explain python... thank you!!

[alzhanvoid]

Hey when the game ends with a horizontal or diag or row as the last input (no "-" on the board remaining but last input made one of 3 lines) it still says that it's a tie despite clearly being a win for one of the players. How can I fix this?

[_iam_seven_]

the most easy way and literally easy to understand. The best tutorial

[exED]

hi just wanted to ask, what does
"-1" in board[inp-1] == "-" ?

[a.hannan_]

while running the "gamerunning func at 9:30, its saying ""bool object is not callable""////--> how do we solve this??

[River]

For those who found the bug that appears when the last input is a winning move, and it displays both the Win AND Tie text, this should fix it. If you add a "exit()" command inside of the "def checkWin()" segment, it should work itself out:

def checkWin():
if checkDiagonal(board) or checkHorizontal(board) or checkRow(board):
print(f"The winner is {winner}")
gameRunning = False
exit()

Since the gameRunning loop checks for a Win BEFORE it checks for a Tie, you only have to apply this to the "def checkWin()" segment :)

[riskatjukyungssi]

I tried running it @9:39 but it keeps telling me “oops player is already in that spot” but there’s no player. I need help

[xzex]

Obviously you are coming from JS, in python we do board = ["-"] * 9 and you don't need to pass board to the function cause it's on global scope and functions defined after that has access to the board.

[subhransu]

so damn awesome my man. i loved it all the way. my first big project in learning python. thanks for the tutorial.

[vanlang]

Great beginner-friendly tutorial on how to build a simple project like TicTacToe!

[karimeissa]

in the function userInput you should call it again recursively in the else statement like this:
def playerInput(board):
inp = int(input("Select a spot 1-9: "))
if board[inp-1] == "-":
board[inp-1] = currentPlayer
else:
print("Oops player is already at that spot.")
playerInput(board)

Because if the user chooses a number which was already chosen it will display the message and then go to the next player, but we want the same user to try again in another spot, not switch players after an error

[Caroline-pbxx]

you make it so easy to understand, but actually making it and developing the program is a whole different story!

[larryhatcher]

This is a great learning tool. One thing we might be able to improve upon is the computer play. I was able to get it to show both "X" wins and "O" wins on the same board. It should shut down immediately after the X move

[woovs]

I m wondering how to get the game to reset after the win. I was thinking that after gamerunning = false you could break the loop... but doesn't seem to work for me... any tips?

[edenlee]

Hi @coachcode for the code board(inp-1) == "-" at 8:02 of the video
I understand that it is to check if the position picked on the board by the player is empty. But why is there -1 from inp? Shouldn't it be just board(inp) to check the availability of the position picked by the player on the board?

[drsoundy]

Something is false I think. If you use a number which is already taken, the player switch. So one person can play two times if the other took a number which has alraedy been used (sry for bad english but hope y'all understand)

[mxo]

Hi, i've found 2 big problems...first if you pplay against the computer he can't win, second if then computer win the game continue and if you win the game give you the win and when the board is full it's a tie. If you play against yourself using this combination of number (1-2-3-4-5-6-8-7-9) the game give you the win but it's a tie and immediately after the game print that it's a tie because the board is full...I'm trying to find where the problems, did you had already found them?

[DiegoSabajo-vf]

Why is the switchPlayer() at the end of the def computer(board) and not behind checkTie(board) in the end?