I am creating a tic-tac-toe game and the move_base function in my script is not working. I have seen this type of if statement used before and I don't know why the function is not working. There are no errors but the function doesn't update num_word or moves. I do not have a lot of python experience so I do not know what I am doing wrong. I will add more features to the game but I can't because the basic part of it is not working. I have not seen any other place that tells me how to fix this.
#tic tac toe game
#global variables
game_over = False
#game script
def game():
#game variables
#positions on the board
one = '1'
two = '2'
three = '3'
four = '4'
five = '5'
six = '6'
seven = '7'
eight = '8'
nine = '9'
positions = [one, two, three, four, five, six, seven, eight, nine]
num_chosen = ''
#moves in the game
moves = 0
#prints board
def board():
print(f'{one}|{two}|{three}')
print(f'{four}|{five}|{six}')
print(f'{seven}|{eight}|{nine}')
#how to check who won
def check_win_base(xo, num1, num2, num3):
if num1 == xo and num2 == xo and num3 == xo:
if(xo == 'x'):
print('x player wins')
game_over = True
elif(xo == 'o'):
print('o player wins')
game_over = True
#check_win_base applied to all numbers
def check_win(xo):
check_win_base(xo, one, two, three)
check_win_base(xo, four, five, six)
check_win_base(xo, seven, eight, nine)
check_win_base(xo, one, four, seven)
check_win_base(xo, two, five, eight)
check_win_base(xo, three, six, nine)
check_win_base(xo, one, five, nine)
check_win_base(xo, three, five, seven)
#checks if game is a draw
def check_draw():
if moves == 9:
print('The game is a draw')
game_over = True
#how to pick a square
def move_base(xo, num_word, num):
if num_chosen == num:
num_word = xo
moves += 1
#move_base applied to all numbers
def move(xo):
move_base(xo, one, 1)
move_base(xo, two, 2)
move_base(xo, three, 3)
move_base(xo, four, 4)
move_base(xo, five, 5)
move_base(xo, six, 6)
move_base(xo, seven, 7)
move_base(xo, eight, 8)
move_base(xo, nine, 9)
#all the required functions put together
def turn(xo):
board()
print(f'{xo} move')
num_chosen = int(input())
move(xo)
check_win(xo)
check_draw()
turn('x')
turn('o')
turn('x')
turn('o')
turn('x')
turn('o')
turn('x')
turn('o')
turn('x')
#checks if game is over or not
if game_over == False:
game()
else:
print('Game Over')
a few key points about variables in python
you may read and change global variables, but cannot assign new values to them unless you specify this is a global variable, therefor this does not work
def check_draw():
if moves == 9:
print('The game is a draw')
game_over = True
but this does
def check_draw():
global game_over
if moves == 9:
print('The game is a draw')
game_over = True
simple types like string,int,float are immutable, means you cannot change them, because in a result you get another object. In this example by changing num_word and moves you actually assign new value which creates local copy of those variables without changing it's global counterpart
def move_base(xo, num_word, num):
if num_chosen == num:
num_word = xo
moves += 1
solution to this mess is simple - use mutable objects, like dict or list, to retain changes
here is example which works (more or less)
# tic tac toe game
#global variables
game_over = False
# game script
def game():
# game variables
# positions on the board
positions = ["one", "two", "three", "four", "five", "six", "seven", "eight", "nine"]
d = {
"one": '1',
"two": '2',
"three": '3',
"four": '4',
"five": '5',
"six": '6',
"seven": '7',
"eight": '8',
"nine": '9',
"num_chosen": "",
"moves": 0, # moves in the game
}
# prints board
def board():
print(f'{d["one"]}|{d["two"]}|{d["three"]}')
print(f'{d["four"]}|{d["five"]}|{d["six"]}')
print(f'{d["seven"]}|{d["eight"]}|{d["nine"]}')
# how to check who won
def check_win_base(xo, num1, num2, num3):
global game_over
if num1 == xo and num2 == xo and num3 == xo:
if(xo == 'x'):
print('x player wins')
game_over = True
elif(xo == 'o'):
print('o player wins')
game_over = True
# check_win_base applied to all numbers
def check_win(xo):
check_win_base(xo, d["one"], d["two"], d["three"])
check_win_base(xo, d["four"], d["five"], d["six"])
check_win_base(xo, d["seven"], d["eight"], d["nine"])
check_win_base(xo, d["one"], d["four"], d["seven"])
check_win_base(xo, d["two"], d["five"], d["eight"])
check_win_base(xo, d["three"], d["six"], d["nine"])
check_win_base(xo, d["one"], d["five"], d["nine"])
check_win_base(xo, d["three"], d["five"], d["seven"])
# checks if game is a draw
def check_draw():
global game_over
if d["moves"] == 9:
print('The game is a draw')
game_over = True
# how to pick a square
def move_base(xo, num_word, num):
if d["num_chosen"] == num:
d[num_word] = xo
d["moves"] += 1
# move_base applied to all numbers
def move(xo):
move_base(xo, "one", 1)
move_base(xo, "two", 2)
move_base(xo, "three", 3)
move_base(xo, "four", 4)
move_base(xo, "five", 5)
move_base(xo, "six", 6)
move_base(xo, "seven", 7)
move_base(xo, "eight", 8)
move_base(xo, "nine", 9)
# all the required functions put together
def turn(xo):
board()
print(f'{xo} move')
d["num_chosen"] = int(input())
move(xo)
check_win(xo)
check_draw()
turn('x')
turn('o')
turn('x')
turn('o')
turn('x')
turn('o')
turn('x')
turn('o')
turn('x')
# checks if game is over or not
if game_over == False:
game()
else:
print('Game Over')