Disable Exit (or [ X ]) in tkinter Window

You can create a function that just uses pass to do nothing.

Take a look at the below:

import tkinter as tkroot=tk.Tk()def close_program():    root.destroy()def disable_event():    passbtn = tk.Button(root, text = "Click me to close", command = close_program)btn.pack()root.protocol("WM_DELETE_WINDOW", disable_event)root.mainloop()

You could also remove the toolbar all together with root.overrideredirect(True) that will prevent the user from using any of the toolbar. leaving root.protocol("WM_DELETE_WINDOW", disable_event) will also prevent the use of ALT + F4.

import tkinter as tkroot=tk.Tk()root.geometry("400x400")root.overrideredirect(True)def close_program():    root.destroy()def disable_event():    passbtn = tk.Button(root, text = "Click me to close", command = close_program)btn.pack()root.protocol("WM_DELETE_WINDOW", disable_event)root.mainloop()

another way to achieve this on windows:

#!python3import tkinter as tkfrom tkinter import ttkimport threading, timeimport tkinter as tkfrom ctypes import windll, wintypesGWL_STYLE = -16WS_CHILD = 0x40000000WS_SYSMENU = 0x00080000SWP_FRAMECHANGED = 0x0020SWP_NOACTIVATE = 0x0010SWP_NOMOVE = 0x0002SWP_NOSIZE = 0x0001# write short names for functions and specify argument and return typesGetWindowLong = windll.user32.GetWindowLongWGetWindowLong.restype = wintypes.ULONGGetWindowLong.argtpes = (wintypes.HWND, wintypes.INT)SetWindowLong = windll.user32.SetWindowLongWSetWindowLong.restype = wintypes.ULONGSetWindowLong.argtpes = (wintypes.HWND, wintypes.INT, wintypes.ULONG)SetWindowPos = windll.user32.SetWindowPosclass App(tk.Tk):    def __init__(self):        tk.Tk.__init__(self)        self.pb = ttk.Progressbar(self, orient="horizontal", length=400, mode="determinate", maximum=100)        self.pb.pack()        tk.Button(self, text="Remove buttons", command=self.remove_buttons).pack()        tk.Button(self, text="Add buttons", command=self.add_buttons).pack()    def start(self):        self.t = threading.Thread(target=self.loop)        self.t.start()    def loop(self):        while True:            for num in range(0, 100):                self.pb['value']=num                time.sleep(0.1)    def _get_hwnd(self):        w_id = self.winfo_id() # gets handle        style = GetWindowLong(w_id, GWL_STYLE) # get existing style        newstyle = style & ~WS_CHILD # remove child style        res = SetWindowLong(w_id, GWL_STYLE, newstyle) # set new style        res = SetWindowPos(w_id, 0, 0,0,0,0, SWP_FRAMECHANGED | SWP_NOACTIVATE | SWP_NOMOVE | SWP_NOSIZE)        hwnd = int(self.wm_frame(), 16) # find handle of parent        res = SetWindowLong(w_id, GWL_STYLE, style) # set back to old style        res = SetWindowPos(w_id, 0, 0,0,0,0, SWP_FRAMECHANGED | SWP_NOACTIVATE | SWP_NOMOVE | SWP_NOSIZE)        return hwnd # return parents handle    def remove_buttons(self):        hwnd = self._get_hwnd()        style = GetWindowLong(hwnd, GWL_STYLE) # get existing style        style = style & ~WS_SYSMENU        res = SetWindowLong(hwnd, GWL_STYLE, style)        res = SetWindowPos(hwnd, 0, 0,0,0,0, SWP_FRAMECHANGED | SWP_NOACTIVATE | SWP_NOMOVE | SWP_NOSIZE)    def add_buttons(self):        hwnd = self._get_hwnd()        style = GetWindowLong(hwnd, GWL_STYLE) # get existing style        style = style | WS_SYSMENU        res = SetWindowLong(hwnd, GWL_STYLE, style)        res = SetWindowPos(hwnd, 0, 0,0,0,0, SWP_FRAMECHANGED | SWP_NOACTIVATE | SWP_NOMOVE | SWP_NOSIZE)if __name__ == "__main__":    app = App()    app.start()    app.mainloop()