card.matched

Hello Efe!

I am guessing this is the part that you have problem with:

  def create_row(self, num):
    row = []
    for column in self.columns:
      for card in self.cards:
        if card.location == f'{column}{num}':
          if card.matched:
            row.append(str(card))
          else:
            row.append('   ')
    return row

Lets take this step by step:

for card in self.cards:
  if card.location == f'{column}{num}':
    if card.matched:
      row.append(str(card))
    else:
      row.append('   ')

1. First we loop through the card deck
2. If the card location is equal to the current position in the loop (which it will be everytime since every card is set to a location in the set_cards method).
3. A second nested if statement determines if the card should be visible or not (if the current card objects instance attribute self.matched is set to True then the cards str dunder gets called and passed to the row.append() function.
4. If the current card objects instance attribute matched is set to False (which it is when its init method is called) then row.append() will get ' ' appended to it since we don't want to show the player the card.

So the answer to your question is that we use if card.matched is just to determine if the player has guessed two or more cards right and then we would want the player to see these cards the next round.

Maybe you already understand this but this:

if card.matched

is the same as this:

if card.matched == True

If something feels unclear, don't hesitate to ask me again :)