Why is my program hanging

Question

from random import *

IQ = []
row1 = ["#", "#", "#"]
row2 = ["#", "#", "#"]
row3 = ["#", "#", "#"]
board = [row1, row2, row3]


def Display_Board():
    print(row1[0],"|", row1[1], "|", row1[2])
    print("----------")
    print(row2[0],"|", row2[1], "|", row2[2])
    print("----------")
    print(row3[0],"|", row3[1], "|", row3[2])

def Automated_Move(board):
    while True:
        RandomMove = randint(0,2)
        if board[RandomMove][RandomMove] == "#":
            board[RandomMove][RandomMove] = "O"
            break
        elif board[RandomMove][RandomMove] != "#":
            pass

while True:
    #print(IQ)
    Display_Board()
    Row = int(input("Row: ")) - 1
    Col = int(input("Col: ")) - 1
    if board[Row][Col] != "X" and board[Row][Col] != "O":
        board[Row][Col] = "X"
        IQ.append(Row)
        IQ.append(Col)
    elif board[Row][Col] == "X" or board[Row][Col] == "O":
        print("This is already Taken")
        pass

    Automated_Move(board)
    print("\n")

I'm trying to make a simple Genetic Algorithm Based Tic-Tac-Toe and I have no idea why it is crashing. I figured out it is in the loop of the Automated_Move Function (If that helps)

Answer 1

Your main loop never ends. There is no break in:

while True:
    #print(IQ)
    Display_Board()
    Row = int(input("Row: ")) - 1
    Col = int(input("Col: ")) - 1
    if board[Row][Col] != "X" and board[Row][Col] != "O":
        board[Row][Col] = "X"
        IQ.append(Row)
        IQ.append(Col)
    elif board[Row][Col] == "X" or board[Row][Col] == "O":
        print("This is already Taken")
        pass

    Automated_Move(board)
    print("\n")

Also your Automated_Move() 's while loop also sooner or later will get into a forever loop.

def Automated_Move(board):
    while True:
        RandomMove = randint(0,2)
        if board[RandomMove][RandomMove] == "#":
            board[RandomMove][RandomMove] = "O"
            break
        elif board[RandomMove][RandomMove] != "#":
            pass

This loop breaks only if there is a '#' element in board (after changing that element to O ). After several iterations, all (diagonal) elements of the board will be 'O' and so the loop will never exit.

One possible solution is to modify the main loop as:

if any(['#' in r for r in board]):
    Automated_Move(board)
else:
    break