类型对象没有属性

Question

I am working on a program, but I am getting the error "Type object 'Card' has no attribute fileName. I've looked for answers to this, but none that I've seen is in a similar case to this.

class Card:
RANKS = (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
SUITS = ('s', 'c','d','h')
BACK_Name = "DECK/b.gif"

def __init__(self, rank, suit):
    """Creates a card with the given rank and suit."""
    self.rank = rank
    self.suit = suit
    self.face = 'down'
    self._fileName = 'DECK/' + str(rank) + suit[0] + '.gif'

class TheGame(Frame):

    def __init__(self):
        Frame.__init__(self)
        self.master.title("Memory Matching Game")
        self.grid()

        self.BackImage = PhotoImage(file = Card.BACK_Name)
        self.cardImage = PhotoImage(file = Card.fileName)

Any help to solving this would be great. thanks.

Answer 1

You have three class attributes: RANKS , SUITS and BACK_Name .

class Card:
    # Class Attributes:
    RANKS = (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
    SUITS = ('s', 'c','d','h')
    BACK_Name = "DECK/b.gif"

You haven't defined fileName as a class attribute so trying to get an attribute named fileName will raise an AttributeError indicating that it doesn't exist.

This is because fileName , or rather, _fileName has been defined as an instance attribute via self._filename :

# Instance Attributes:
def __init__(self, rank, suit):
    """Creates a card with the given rank and suit."""
    self.rank = rank
    self.suit = suit
    self.face = 'down'
    self._fileName = 'DECK/' + str(rank) + suit[0] + '.gif'

To access this attribute you must first create an instance of the Card object with with c = Card(rank_value, suit_value) ; then you can access the _filename via c._filename .