minsize() and maxsize() methods doesn't work in tkinter python(Toplevel)

Question

I was recently trying to make a pdf viewer in python, so I set the minsize() and maxsize() of the window but it doesn't seem to work. Here is my code.

from pdf2image import convert_from_path
import tkinter as tk
from tkinter import filedialog
from PIL import Image, ImageTk

root4=tk.Toplevel()
root4.geometry("800x900")
root4.title("PDF Viewer")
root4.configure(bg="#202020")
root4.minsize(300, 200)
root4.maxsize(900, 800)

pdf_frame = tk.Frame(root4)
pdf_frame.pack(fill=tk.BOTH,expand=1)

scrol_y = tk.Scrollbar(pdf_frame,orient=tk.VERTICAL)
pdf = tk.Text(pdf_frame,yscrollcommand=scrol_y.set,bg="grey")

scrol_y.pack(side=tk.RIGHT,fill=tk.Y)
scrol_y.config(command=pdf.yview)
pdf.pack(fill=tk.BOTH,expand=1)


pages = convert_from_path(filedialog.askopenfilename(initialdir = "/",title = "Select file",filetypes = (("pdf files","*.pdf"),("all files","*.*"))),size=(800,900))

photos = []

for i in range(len(pages)):
  photos.append(ImageTk.PhotoImage(pages[i]))

for photo in photos:
  pdf.image_create(tk.END,image=photo)
  pdf.insert(tk.END,'\n\n')

root4.update()
root4.mainloop()

Answer 1

When your creating a parent window use Tk(), else using Toplevel() will create a Tk()(for which the minsize and maxsize doesnt apply) window without you asking for it and you mightve misunderstood that for your root4 window, so just say:

tk.Tk().withdraw()
root4 = tk.Tk()

This fixed the issue of two windows popping up, for me. Keep in mind the minsize() and maxsize() works, its just that you were trying it on the wrong window.