line 19 used_locations.append(random_location) Syntax Error

from cards import Card
import random
class Game:
  def __init__(self):
    self.size = 4
    self.card_options = ["Goat", "Maid", "Toad", "Tape", "Hill", "Farm", "Frog", "Girl"]
    self.columns = ["A", "B", "C", "D"]
    self.cards = []
    self.locations = []
    for column in self.columns:
      for num in range(1, self.size + 1):
        print(f'{column}{num}')
  def set_cards(self):
    used_locations = []
    for word in self.card_options:
      for i in range(2):
        available_locations = set(self.locations) - set(self.used_locations)
        random_location = random.choice(list(available_locations)
        used_locations.append(random_location)
        card = Card(word, random_location)
        self.cards.append(card)


if __name__ == '__main__':
  game = Game()
  game.set_cards()
  for card in game.cards:
    print(card)