A tic-tac-toe in python

tic-tac-toe.py

import os

GAME_BOARD = [[' '] * 3 for _ in range(3)]
COL = ROW = 3

def print_game_board():
    count_row = 0
    for row in GAME_BOARD:
        a_row = ""
        for col in row:
            a_row += "┃" + col
        a_row += "┃"
        if count_row == 0:
            print("┏━┳━┳━┓")
        else:
            print("┣━╋━╋━┫")
        count_row += 1
        print(a_row)
    print("┗━┻━┻━┛")

def draw(who, x, y):
    if x >= COL or x < 0:
        print("invalid position, x should be in range (0, 2)")
        return False

    if y >= ROW or y < 0:
        print("invalid position, y should be in range (0, 2)")
        return False

    if GAME_BOARD[x][y] != ' ':
        print("position", x, ",", y, "is taken!")
        return False

    GAME_BOARD[x][y] = who
    return True

def _3_in_a_row(target):
    cross_1st_row = (
        GAME_BOARD[0][0] == target
        and GAME_BOARD[0][1] == target
        and GAME_BOARD[0][2] == target
    )
    cross_2nd_row = (
        GAME_BOARD[1][0] == target
        and GAME_BOARD[1][1] == target
        and GAME_BOARD[1][2] == target
    )
    cross_3rd_row = (
        GAME_BOARD[2][0] == target
        and GAME_BOARD[2][1] == target
        and GAME_BOARD[2][2] == target
    )
    return cross_1st_row or cross_2nd_row or cross_3rd_row

def _3_in_a_col(target):
    cross_1st_col = (
        GAME_BOARD[0][0] == target
        and GAME_BOARD[1][0] == target
        and GAME_BOARD[2][0] == target
    )
    cross_2nd_col = (
        GAME_BOARD[0][1] == target
        and GAME_BOARD[1][1] == target
        and GAME_BOARD[2][1] == target
    )
    cross_3rd_col = (
        GAME_BOARD[0][2] == target
        and GAME_BOARD[1][2] == target
        and GAME_BOARD[2][2] == target
    )
    return cross_1st_col or cross_2nd_col or cross_3rd_col

def _3_in_a_diagonal(target):
    left_to_right = (
        GAME_BOARD[0][0] == target
        and GAME_BOARD[1][1] == target
        and GAME_BOARD[2][2] == target
    )
    right_to_left = (
        GAME_BOARD[0][2] == target
        and GAME_BOARD[1][1] == target
        and GAME_BOARD[2][0] == target
    )
    return left_to_right or right_to_left

def is_win(player):
    return _3_in_a_row(player) or _3_in_a_col(player) or _3_in_a_diagonal(player)

def get_pos(inp):
    x, y = inp.split(",")
    return int(x), int(y)

def swap(player):
    if player == "O":
        return "X"
    return "O"

def play():
    who = "X"
    while True:
        print_game_board()
        print("please enter the position (x, y) for '", who, "'")
        user_input = input()
        x, y = get_pos(user_input)
        success = draw(who, x, y)
        if not success:
            continue

        if is_win(who):
            return who
            
        who = swap(who)

winner = play()
print_game_board()
print("Congrats!", winner, "won the game!")