Board is not being reset, tic tac toe game

Question

I am trying to make a tic tac toe game and I am very new to python so I was wondering why my board was not getting reset despite my functions explicitly resetting the board.

I tried getting rid of the function and just implementing a reset where each value was replaced with an underscore like the original Board list but I want to make this more efficient.

CODE

import random
score=0
AIscore=0
PlayerSym="X"
AIsymbol="O"
Win=False
ListTF=[True,False]
Board=[["_","_","_"], 
       ["_","_","_"],
       ["_","_","_"]]

def resetGame():
    Board=[["_","_","_"], 
       ["_","_","_"],
       ["_","_","_"]]
    print("resetting board ///////////////////////////////////////////")


def initiateGame(Win,AIsymbol):
    print("Welcome to tic tac toe")
    print("If you score 3 points you win")
    print("pick a row and column to place your symbol:")
    
    
def Symbols():
    TF=random.choice(ListTF)
    if Win==False:
        PlayerSym="X"
        print("player, you are 'X' so you go first")
        AIsymbol="O"
    else:
        if TF==True:
            PlayerSym="X"
            AIsymbol="O"
            print("player, you are 'X' so you go first")
        if TF==False:
            PlayerSym="O"
            AIsymbol="X"
            print("player, you are 'O' so you go second")    


def GameWinner(score,Board,AIscore):
    for row in range(0,3): #checks all columns for a win
        if(Board[row][0]==Board[row][1] == Board[row][2] == PlayerSym):
            Win=True
            print("congrats, you have earned a point")
            print("the score is:")
            score=score+1
            print("Player:",score)
            print("AI:",AIscore)
            resetGame()
        elif(Board[row][0]==Board[row][1] == Board[row][2] == AIsymbol):
            Win=False
            print("The AI has earned a point")
            print("the score is:")
            print("Player:",score)
            AIscore=AIscore+1
            print("AI:",AIscore)
            resetGame()  
    if(Board[0][0]==Board[1][1] == Board[2][2] == PlayerSym):
        Win=True
        print("congrats, you have earned a point")
        print("the score is:")
        score=score+1
        print("Player:",score)
        print("AI:",AIscore)
        resetGame()
    elif(Board[0][0]==Board[1][1] == Board[2][2] == AIsymbol):
        Win=False
        print("The AI has earned a point")
        print("the score is:")
        print("Player:",score)
        AIscore=AIscore+1
        print("AI:",AIscore)
        resetGame()
    if(Board[0][2]==Board[2][0] == Board[1][1] == PlayerSym):
        Win=True
        print("congrats, you have earned a point")
        print("the score is:")
        score=score+1
        print("Player:",score)
        print("AI:",AIscore)
        resetGame()
    elif(Board[0][2]==Board[2][0] == Board[1][1] == AIsymbol):
        Win=False
        print("The AI has earned a point")
        print("the score is:")
        print("Player:",score)
        AIscore=AIscore+1
        print("AI:",AIscore)
        resetGame() 
        
def Space(Board,PlayerSym,AIsymbol):
    print(Board[0])
    print(Board[1])
    print(Board[2])
    row=int(input("pick a row from (0-2):"))
    column=int(input("pick a column from (0-2)"))
    while (row>2 or row<0) or (column>2 or column<0):
        print("you entered a value that is not within the parameters, pick again")
        row=int(input("pick a row from (0-2):"))
        column=int(input("pick a column from (0-2)"))
    while (Board[row][column]==PlayerSym or Board[row][column]==AIsymbol):
        print("your row and column already has an 'X' or 'O', pick again") 
        row=int(input("pick a row from (0-2):"))
        column=int(input("pick a column from (0-2)"))
    Board[row][column]=PlayerSym
    

initiateGame(Win,AIsymbol)

def main():
        Symbols()
        GameWinner(score,Board,AIscore)
        Space(Board,PlayerSym,AIsymbol)
        

while True:
    main()

Answer 1

As @quamrana stated, your resetGame() function is spawning a new Board = [[ ... ]], but that's all it is doing here. You are not referencing the previously spawned Board at all, so this new Board that exists within the resetGame() scope and does not interact with the global version that you are trying to reset. A simple fix for this would be to return your new board, and assign that value whenever you'd like the board reset. E.g.:

def resetGame():
    newBoard =[["_","_","_"], 
               ["_","_","_"],
               ["_","_","_"]]
    return newBoard 

   ...

Board = resetGame()

Alternatively, you can target the global variable directly with the global keyword, which adds the variable in question to the method scope:

def resetGame():
    global Board
    Board= [["_","_","_"], 
            ["_","_","_"],
            ["_","_","_"]]

   ...

resetGame()

Here's a good resource on how scope works in python to help you: https://www.w3schools.com/python/python_scope.asp

Cheers, best of luck!