从另一个python文件调用函数后，canvas不显示图像

我有两个文件：

mainfile.py：单击have按钮时，它应该调用另一个文件（showfile.py），该文件具有包含画布图像的函数，但未加载任何内容

mainfile.py

from tkinter import *
import tkinter as tk
from showfile import sho

class Window(tk.Frame):


    def __init__(self, master=None):
        tk.Frame.__init__(self, master, bg='#333333')

        menu = tk.Menu(self.master)
        master.config(menu=menu)

        root.minsize(width=1080, height=750)
        width, height = root.winfo_screenwidth(), root.winfo_screenheight()
        root.geometry('%dx%d+0+0' % (width, height))
        root.iconbitmap("p.ico")

        full = Button(root, text="Full Screen", command=sho, padx=10, pady=10, borderwidth=6)
        full.pack(pady=20)
        full.place(x=100, y=500)



root = Tk()
root.geometry("%dx%d" % (300, 300))
root.title("BMP Image GUI")
app = Window(root)

app.pack(fill=tk.BOTH, expand=1)

root.mainloop()

showfile.py

from tkinter import *
from PIL import ImageTk, Image
import tkinter as tko



def sh():
    lan = tko.Tk()  # Creating instance of Tk class
    lan.title("Centering windows")
    lan.resizable(False, False)  # This code helps to disable windows from resizing
    window_height = 300
    window_width = 500
    screen_width = lan.winfo_screenwidth()
    screen_height = lan.winfo_screenheight()
    x_cordinate = int((screen_width / 2) - (window_width / 2))
    y_cordinate = int((screen_height / 2) - (window_height / 2))
    lan.geometry("{}x{}+{}+{}".format(window_width, window_height, x_cordinate, y_cordinate))

    filename = "iy.jpg"
    load = Image.open(filename)
    w, h = load.size
    image = filename
    render2 = ImageTk.PhotoImage(load)  # must keep a reference to this

    lastwidth, lasthight = w,h
    image = load.resize((int(lastwidth), int(lasthight)), Image.ANTIALIAS)
    canvas2 = tko.Canvas(lan,width=lastwidth, height=lasthight)
    canvas2.pack(fill=tko.BOTH, expand=True)
    canvas2.pack()
    canvas2.place(relx=0.5, rely=0.5, anchor=CENTER)

    render2 = ImageTk.PhotoImage(image)

    canvas2.create_image(lastwidth / 2, lasthight / 2, image=render2, anchor=CENTER)

    render2 = ImageTk.PhotoImage(load)

---

但当我运行此文件时，，，它会在没有加载图像的情况下弹出，并给出错误：tkinter.TclError:image“pyimage1”不存在

这是一个错误，当您使用多个

Tk（）

，将子窗口替换为我替换的

Toplevel（）。但还是同样的问题同样的错误？或者呢？如果函数中加载的图像的引用没有保存在全局空间中，那么它将被垃圾收集。是的，它会给出相同的错误