标题可与错误行一起使用，但在删除糟糕的线时不会固定运行

Question

）。但是，该程序即使在遇到错误后也可以按预期工作。如果删除这一行，图像将不会显示我无法弄清楚为什么

import tkinter as tk
from PIL import Image, ImageTk
import string # string.ascii_lowercase = "abcdefghijklmnopqrstuvwxyz"

def on_enter(event):
    global image_label
    btn=str(event.widget)

    match btn:
        case ".1":
            img = Image.open("District_1b.png")
        case ".2":
            img = Image.open("District_2b.png")
        case ".3":
            img = Image.open("District_3b.png")
        case ".4":
            img = Image.open("District_4b.png")            
        case ".5":
            img = Image.open("District_5b.png")            
        case ".6":
            img = Image.open("District_6b.png")            
        case ".7":
            img = Image.open("Districtsb.png")

    img = ImageTk.PhotoImage(img)
    image_label.configure(image=img)
    photo = ImageTk.PhotoImage(img)
    
def on_leave(event):
    global image_label
    #image_label.destroy()

root = tk.Tk()

button1 = tk.Button(root, text="District I", name="1")
button1.grid(row=0,column=0)
button2 = tk.Button(root, text="District II", name="2")
button2.grid(row=0,column=1)
button3 = tk.Button(root, text="District III", name="3")
button3.grid(row=0,column=2)
button4 = tk.Button(root, text="District IV", name="4")
button4.grid(row=0,column=3)
button5 = tk.Button(root, text="District V", name="5")
button5.grid(row=0,column=4)
button6 = tk.Button(root, text="District VI", name="6")
button6.grid(row=0,column=5)
button7 = tk.Button(root, text="All District's", name="7")
button7.grid(row=0,column=6)

img = Image.open("Screenshot 2024-12-13 144137.png")
img = ImageTk.PhotoImage(img)
image_label = tk.Label(root,width=1400, image=img)
image_label.grid(row=1,column=0, columnspan=8)

button1.bind("<Enter>", on_enter)
button1.bind("<Leave>", on_leave)
button2.bind("<Enter>", on_enter)
button2.bind("<Leave>", on_leave)
button3.bind("<Enter>", on_enter)
button3.bind("<Leave>", on_leave)
button4.bind("<Enter>", on_enter)
button4.bind("<Leave>", on_leave)
button5.bind("<Enter>", on_enter)
button5.bind("<Leave>", on_leave)
button6.bind("<Enter>", on_enter)
button6.bind("<Leave>", on_leave)
button7.bind("<Enter>", on_enter)
button7.bind("<Leave>", on_leave)

root.mainloop()

我知道photoImage“对象没有属性”，但是，如果我将其评论或简单地删除。图像只是显示一个空白区域。如果剩下错误，我可以将每个按钮悬停，即使已命中错误，图像也会按预期更新。

sissue解释
您遇到的问题是由Python的垃圾收集机制引起的。
您正在创建一个photoimage对象（img = imagetk.photoimage（img））on_enter函数。
但是，当功能结束时，如果您不关注IMG的引用，则Python将自动删除它。
这就是为什么当您删除看似冗余的线照片= Imagetk.photoimage（IMG）时，您的图像也会消失的原因，即使它从未使用过。
解决方案
要解决此问题，请将对IMG的引用存储为全局变量：

fixed代码：

import tkinter as tk
from PIL import Image, ImageTk

def on_enter(event):
    global image_label, current_image
    btn = str(event.widget)

    match btn:
        case ".1":
            img = Image.open("District_1b.png")
        case ".2":
            img = Image.open("District_2b.png")
        case ".3":
            img = Image.open("District_3b.png")
        case ".4":
            img = Image.open("District_4b.png")            
        case ".5":
            img = Image.open("District_5b.png")            
        case ".6":
            img = Image.open("District_6b.png")            
        case ".7":
            img = Image.open("Districtsb.png")

    current_image = ImageTk.PhotoImage(img)  # Store in global variable
    image_label.configure(image=current_image)

def on_leave(event):
    global image_label
    # Optionally, reset to a default image when leaving
    # image_label.configure(image=default_image)

root = tk.Tk()

button1 = tk.Button(root, text="District I", name="1")
button1.grid(row=0,column=0)
button2 = tk.Button(root, text="District II", name="2")
button2.grid(row=0,column=1)
button3 = tk.Button(root, text="District III", name="3")
button3.grid(row=0,column=2)
button4 = tk.Button(root, text="District IV", name="4")
button4.grid(row=0,column=3)
button5 = tk.Button(root, text="District V", name="5")
button5.grid(row=0,column=4)
button6 = tk.Button(root, text="District VI", name="6")
button6.grid(row=0,column=5)
button7 = tk.Button(root, text="All District's", name="7")
button7.grid(row=0,column=6)

# Load initial image
default_image = Image.open("Screenshot 2024-12-13 144137.png")
default_image = ImageTk.PhotoImage(default_image)

image_label = tk.Label(root, width=1400, image=default_image)
image_label.grid(row=1, column=0, columnspan=8)

# Keep a global reference for images
current_image = default_image  

# Bind events
for btn in (button1, button2, button3, button4, button5, button6, button7):
    btn.bind("<Enter>", on_enter)
    btn.bind("<Leave>", on_leave)

root.mainloop()

Answer 1

关键修复： 添加了一个全局变量current_image来存储摄影图的引用。 删除照片= Imagetk.photoimage（IMG）（由于不必要）。 确保image_label.configure（image = current_image）使用存储的图像参考，以防止垃圾收集删除它。 现在，即使删除行27时，您的图像也应正确显示。