Tkinter标签图像变为空白

Question

This code I am writing is supposed to add a picture every time a button is clicked, but after I do more than one the last picture disappears.

import tkinter

suits = ["club", "heart", "diamond", "spade"]
faces = ["jack", "queen", "king"]


def deal():
    global value
    global card
    global deck
    value, card = deck.pop(0)
    print(deck)
    return card

def image():
    global count
    tkinter.Label(root, image=deal()).grid(row=1, column=count)
    count += 1

root = tkinter.Tk()

deck = []

for x in range(1, 11):
    for y in suits:
        pic = "cards/{}_{}.png".format(x, y)
        img = tkinter.PhotoImage(file=pic)
        deck.append((x, img))

    for z in faces:
        pic = "cards/{}_{}.png".format(z, y)
        img = tkinter.PhotoImage(file=pic)
        deck.append((10, img))

value, card = deck.pop(0)
count = 0

tkinter.Button(root, text="Click me", command=image).grid(row=0, column=0)
root.mainloop()

How should I fix this?

Answer 1

The problem is that when you call deal again, the PhotoImage stored in card is replaced by another one, so it is garbage collected and it disappears. To prevent that, you can create a list of pictures:

import tkinter

suits = ["club", "heart", "diamond", "spade"]
faces = ["jack", "queen", "king"]
pictures = []

def deal():
    global value
    global card
    global deck
    value, card = deck.pop(0)
    print(deck)
    return card

def image():
    global count
    tkinter.Label(root, image=deal()).grid(row=1, column=count)
    count += 1

root = tkinter.Tk()

deck = []

for x in range(1, 11):
    for y in suits:
        pic = "cards/{}_{}.png".format(x, y)
        img = tkinter.PhotoImage(file=pic)
        pictures.append(img)
        deck.append((x, img))

    for z in faces:
        pic = "cards/{}_{}.png".format(z, y)
        img = tkinter.PhotoImage(file=pic)
        pictures.append(img)
        deck.append((10, img))

value, card = deck.pop(0)
count = 0

tkinter.Button(root, text="Click me", command=image).grid(row=0, column=0)
root.mainloop()