Is it possible to display the icon for my toplevel and root window after removing the minimize and maximize buttons? I tried using -toolwindow but the icon can't be displayed afterwards. Is there another way I can remove the min and max size buttons from window while still displaying the icon?

from tkinter import *def top():tp = Toplevel()tp.geometry("300x300")tp.attributes("-toolwindow", 1)tp.iconbitmap("My icon.ico")root = Tk()
root.geometry("400x400")b = Button(root, text="open window with icon", command=top).pack()root.mainloop()

Windows-specific solution

First option is to make your toplevel window transient for the root window which is a really simple solution.
All you need to do is change line tp.attributes("-toolwindow", 1) to tp.transient(root)!

Second option is more complicated, but more universal within the Windows system.
Each window in the Windows system has it's own style, which is represented as a logical disjunction of bit-styles. You can build the new style from a scratch or set new style to disjunction of the old one with a bit-style (to switch it on) or to conjunction of the old one with a negation of bit-style (to switch it off):

• To switch off minimize/maximize:
  new style = old style AND NOT Maximize AND NOT Minimize
• To switch on minimize/maximize:
  new style = old style OR Maximize OR Minimize

For all that interaction we need the ctypes library (comes with python) and a set of the WinAPI functions:

• GetWindowLong - to get a current style of the window
• SetWindowLong - to set a new style of the window
• SetWindowPos - to update the window (note remarks section)
• GetParent - to get a hwnd of the owner window, because we're trying to make changes in the non-client area.

Check this example:

import tkinter as tk
import ctypes#   shortcuts to the WinAPI functionality
set_window_pos = ctypes.windll.user32.SetWindowPos
set_window_long = ctypes.windll.user32.SetWindowLongPtrW
get_window_long = ctypes.windll.user32.GetWindowLongPtrW
get_parent = ctypes.windll.user32.GetParent#   some of the WinAPI flags
GWL_STYLE = -16WS_MINIMIZEBOX = 131072
WS_MAXIMIZEBOX = 65536SWP_NOZORDER = 4
SWP_NOMOVE = 2
SWP_NOSIZE = 1
SWP_FRAMECHANGED = 32def hide_minimize_maximize(window):hwnd = get_parent(window.winfo_id())#   getting the old styleold_style = get_window_long(hwnd, GWL_STYLE)#   building the new style (old style AND NOT Maximize AND NOT Minimize)new_style = old_style & ~ WS_MAXIMIZEBOX & ~ WS_MINIMIZEBOX#   setting new styleset_window_long(hwnd, GWL_STYLE, new_style)#   updating non-client areaset_window_pos(hwnd, 0, 0, 0, 0, 0, SWP_NOMOVE | SWP_NOSIZE | SWP_NOZORDER | SWP_FRAMECHANGED)def show_minimize_maximize(window):hwnd = get_parent(window.winfo_id())#   getting the old styleold_style = get_window_long(hwnd, GWL_STYLE)#   building the new style (old style OR Maximize OR Minimize)new_style = old_style | WS_MAXIMIZEBOX | WS_MINIMIZEBOX#   setting new styleset_window_long(hwnd, GWL_STYLE, new_style)#   updating non-client areaset_window_pos(hwnd, 0, 0, 0, 0, 0, SWP_NOMOVE | SWP_NOSIZE | SWP_NOZORDER | SWP_FRAMECHANGED)def top():tp = tk.Toplevel()#   tp.geometry('300x300')#   tp.iconbitmap('icon.ico')hide_minmax = tk.Button(tp, text='hide minimize/maximize', command=lambda: hide_minimize_maximize(tp))hide_minmax.pack()show_minmax = tk.Button(tp, text='show minimize/maximize', command=lambda: show_minimize_maximize(tp))show_minmax.pack()root = tk.Tk()
root.geometry('400x400')
b = tk.Button(root, text='open window with icon', command=top)
b.pack()root.mainloop()