python 3.x - Unexpected Blank Window Tkinter

Question

A blank window along with the main window is created.

I've seen other questions but my case is different I'm not using any constructor. The blank window appears when I initialize ttk.style.

correct_style = ttk.Style()
correct_style.configure('correct.TButton',background='#39b54a')
root = ThemedTk(theme="equilux")

If I delete these lines, the empty window doesn't appear.

Answer 1

I think you call the two lines before creating the instance of Tk(), something like below:

import tkinter as tk
from tkinter import ttk

correct_style = ttk.Style()
correct_style.configure('correct.TButton',background='#39b54a')

root = tk.Tk()
...
root.mainloop()

As ttk.Style() requires an instance of Tk(), if there is none, it will be created implicitly for you. So there will be two instances of Tk().

Move the two lines after creating Tk():

import tkinter as tk
from tkinter import ttk

root = tk.Tk()

correct_style = ttk.Style()
correct_style.configure('correct.TButton',background='#39b54a')

...
root.mainloop()