I get "too early to create image" on tkinter

TL;DR Let's execute Tk () first

Status

When I was trying to make a GUI program using tkinter, I tried to display an image on canvas, and when I wrote it, I got an error, so I tried to check the contents with ipython.

ipython


from PIL import Image, ImageTk
import tkinter as tk

img = Image.open("hoge.png ")
imgtk = ImageTk.PhotoImage(img)

Then

RuntimeError: Too early to create image

I couldn't move on

Cause

PhotoImage () cannot be used unless tk.Tk () is called first.

Coping

When I was trying to parse with ipython, it became like this because tk.Tk () in the original script was not reflected. The error that was originally in trouble was in the image, so I was confused and the discovery was delayed. On ipython, if you call root = tk.Tk () and Tk () appropriately, there is no problem after that.

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