Labels appearing buffered, but Python code is running unbuffered

Question

I am currently creating a blackjack game using Python3 on Sublime Text. When the dealers cards are drawn one by one, you can see it being drawn one by one in the console using the after() to call on different functions, but in the actual GUI all the cards are appearing at the same time, right at the end.

Here is a portion of the code:

def d_pick_a_card():
    global d_hand
    global card
    global deck
    global d_counter
    global cvpath
    global cardvalue 
    global d_card_relx
    global cv 
    cardvalue = 0
    card = deck.pop(0)
    print('Drew',card)
    if card == 'J':
        cardvalue = 10
        cvpath = 11
    elif card == 'Q':
        cardvalue = 10
        cvpath = 12
    elif card == 'K':
        cardvalue = 10
        cvpath = 13
    elif card == 'A':
        cardvalue = 11
        cvpath = 14
    else:
        cardvalue = card
        cvpath = card
    d_hand.append(cardvalue)
    random.shuffle(deck)
    random.shuffle(deck)
    d_counter += 1

#THIS IS THE FUNCTION THAT SHOWS THE VISUAL CARD ON THE GUI
def d_pick_vis(cardvalue, d_counter):
    global dealers_turn
    global card_frame
    card_frame = tk.Label(top, image = cv[cvpath]) 
    card_frame.place(relx= d_card_relx[d_counter], rely=.18, anchor='center')
    widgetList.append(card_frame)

def dturnfunc():
    global dealersturn_img
    holding_img1.pack_forget()
    dealersturn_img = tk.Label(top, image = dealersturn)
    dealersturn_img.img = dealersturnpath
    dealersturn_img.pack()
    top.after(500, dealers_turn())

def dealers_turn():
    global cardvalue
    global d_counter
    d_pick_a_card()
    d_pick_vis(cardvalue, d_counter)
    print("The Dealers hand is:", sum(d_hand))
    print('\n')
    if sum(d_hand) <= sum(hand):
        print('Dealer picks again')
        top.after(500,dealers_turn_2())
    elif sum(d_hand) == 21:
        print('Dealer Wins')
    elif sum(d_hand) >= 22:
        print('You win!')
    else:
        print('Dealer Wins')

Answer 1

You are calling the functions in your calls to after(), instead do this:

top.after(500, dealers_turn)  # Note: just pass in the name of the function

...

top.after(500, dealers_turn_2)

You need to pass in a reference to the function and after() will call that function after the time elapses.

When you were calling the functions yourself, you pass in the return value, which is probably None which, I'm guessing, after() ignores.