Dungeon game map coordinates?

import random
import sys

# Python convention - capitalise something that is a constant (cells wont change)
CELLS = [(0,0), (0,1), (0,2),
         (1,0), (1,1), (1,2),
         (2,0), (2,1), (2,2)]   

def get_locations():
    monster = random.choice(CELLS)
    door = random.choice(CELLS)
    start = random.choice(CELLS)

    if monster == door or monster == start or door == start:
        return get_locations() #repeat the function until unique values

    return monster, door, start

def move_player(player,move):
    x,y = player
    if move == 'LEFT':
        x -= 1
    elif move == 'RIGHT':
        x += 1
    elif move == 'DOWN':
        y -= 1
    elif move == 'UP':
        y += 1
    # if move is left, x - 1
    # if move is right, x + 1
    # if move is down, y - 1
    # if move is up, y + 1
    return x, y

#This is a much more efficient way than I did it. Using an IF statement rather than elif also means it doesn't matter what the other coordinate value is - VERY CLEVER
def get_moves(player):
    moves = ['LEFT', 'RIGHT', 'DOWN', 'UP']
    if player[0]==0:
        moves.remove('LEFT')
    if player[0]==2:
        moves.remove('RIGHT')
    if player[1]==0:
        moves.remove('DOWN')
    if player[1]==2:
        moves.remove('UP')

    return moves    
# if player's x is 0, remove LEFT
# if player's y is 0, remove DOWN
# if player's x is 2, remove RIGHT
# if player's y is 2, remove UP 

def draw_map(player):
    print(' _ _ _')
    tile = '|{}'

    for idx, cell in enumerate(CELLS):
        if idx in [0, 1, 3, 4, 6, 7]: # ie in left or centre tiles - select these as we don't want a new line.
            if cell == player:
                sys.stdout.write(tile.format('X')) # If I just use 'print' here I would get a blank space after each underscore and the map looks odd. In Python 3 can just use the print statement with an 'end' statement to avoid printing out a blank space.
            else:
                sys.stdout.write(tile.format('_'))
        else:
            if cell == player:
                print(tile.format('X|'))
            else:
                print(tile.format('_|'))


# Get the player, monster and door locations
monster, door, player = get_locations()
print("Welcome to the Dungeon!")

while True:
    moves = get_moves(player)

    print("You're currently in room {}".format(player))

    draw_map(player)

    print("You can move {}".format(moves))
    print("Enter QUIT to quit")

    move = raw_input("> ")
    move = move.upper()

    if move == 'QUIT':
        break
    if move in moves:
        player = move_player(player,move)
    else:
        print("Walls are hard - stop walking into them!")
        continue

    if player == door:
        print("You escaped!")
        break
    elif player == monster:
        print("You were eaten by the monster!")
        break

        # if it's a valid move, change the player's position
        # if it's not a valid move (e.g want to go up and they're already at the upper edge),           don't change anything
        # if the new player position is the door, they win!
        # if the new player position is the monster, they lose!
        # otherwise, continue