如何在标签内显示图像

Question

我尝试将图像放在标签内，但它只是显示一个没有图像的白框。我还尝试将其放在app = APP（）之后，但说创建图像还为时过早。请帮助...

from tkinter import *

import tkinter as tk

class HomePage(tk.Frame):
    def __init__(self, parent, controller):
        tk.Frame.__init__(self, parent)
        photo1=PhotoImage(file="phy.gif")
        button = tk.Button(self, text="Topics",font="Arial 
20",bg="#1F2833",fg="#C5C6C7",bd=5, command=lambda: 
controller.show_frame(TopicPage))
        button.place(width=200, height=50, x=0, y=0)
        button1 = tk.Button(self, text="About",font="Arial 
20",bg="#1F2833",fg="#C5C6C7",bd=5, command=lambda: 
controller.show_frame(AboutPage))
        button1.place(width=200, height=50, x=200, y=0)
        label= tk.Label(self, text="\n\n Physics Equation Simulator\n", 
fg="#66FCF1", bg="#1F2833", font="Algerian 36 bold")
        label.place(x=85, y=100)
        label1= tk.Label(self, image=photo1)
        label1.place(x=200, y=300)


app = APP()
app.geometry("900x600")
app.resizable(0, 0)
app.mainloop()