TypeError: 'list' object is not callable.

from cards import Card
import random
class Game():
  def __init__(self):
    self.size = 4
    self.card_options = ["Box", "Egg", "Cop", "Orb", "Top", "Hut", "Gum", "Cat"]
    self.columns = ["A", "B", "C", "D"]
    self.cards = []
    self.locations = []
    for column in self.columns:
      for num in range(1, self.size + 1):
        self.locations.append(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(used_locations)
        random_location = random.choice(list(available_locations))
        used_locations.append(random_location)
        card = Card(word, random_location)
        self.cards.append(card)

  def create_row(self, num):
    row = []
    for column in self.columns:
      for card in self.cards:
        pass


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