详解python tkinter 图片插入问题

import tkinter

class Gui:
  def __init__(self):  
    self.gui=tkinter.Tk()                        # create gui window
    self.gui.title("Image Display")                   # set the title of gui 
    self.gui.geometry("800x600")                    # set the window size of gui 

    img = tkinter.PhotoImage(file="C:/Users/15025/Desktop/bear.gif")  # read image from path

    label1=tkinter.Label(self.gui,image=img)              # create a label to insert this image
    label1.grid()                            # set the label in the main window
 
    self.gui.mainloop()                         # start mainloop

main = Gui()

import tkinter
from PIL import Image
from PIL import ImageTk


class Gui:
  def __init__(self):  
    self.gui=tkinter.Tk()                # create gui window
    self.gui.title("Image Display")           # set the title of gui 
    self.gui.geometry("800x600")            # set the window size of gui 

    load = Image.open("C:/Users/15025/Desktop/1.png")  # open image from path
    img = ImageTk.PhotoImage(load)           # read opened image

    label1=tkinter.Label(self.gui,image=img)      # create a label to insert this image
    label1.grid()                    # set the label in the main window
 
    self.gui.mainloop()                 # start mainloop

main = Gui()

import tkinter as tk
from PIL import Image
from PIL import ImageTk


class Gui(tk.Tk):
  def __init__(self):
    super().__init__()
    self.title("Figure dynamic show v1.01")
    # self.geometry("1000x800+400+100")
    self.mainGui()
    # self.mainloop()
    

  def mainGui(self):
    image = Image.open("C:/Users/15025/Desktop/1.png")
    photo = ImageTk.PhotoImage(image)
    label = tk.Label(self, image=photo)
    label.image = photo     # in case the image is recycled
    label.grid()
    

main = Gui()
main.mainloop()