Message='int' object is not subscriptable

[deanhystad]

Your method for randomly choosing coordinates is very inefficient. Here's a little program that counts how long it takes to randomly select 64 different numbers in the range 1..64.

import random

for _ in range(10):
    used_spots = set()
    i = 0
    while len(used_spots) < 64:
        used_spots.add(random.randint(1, 64))
        i += 1
    print(i)

Output:
309
478
209
320
306
452
295
221
393
327

You do not put cards back in the deck while dealing a hand, so why not use the same kind of subtractive logic for coordinates. This code makes a "deck" of coordinates and shuffles the deck. To get a random coordinate you just deal the top card.

import random

random_coords = [r+c for r in 'abcdefgh' for c in '12345678']  # Make list of all coordinates
random.shuffle(random_coords)

for _ in range(5):
    print(random_coords.pop())  # Deal the top card