How do I create a popup window in tkinter?

I found 3 mistakes

• use Toplevel() instead of Tk() to create second/third window
• command= expects callback - function name without ()
  (but you use popupBonusWindow.destroy())
• don't mix pack() and grid() in one window or frame
  (but you use grid() and pack() in popup)

But you can also use built-in messageboxes like showinfo()

import tkinter as tkfrom tkinter import ttkfrom tkinter.messagebox import showinfodef popup_bonus():    win = tk.Toplevel()    win.wm_title("Window")    l = tk.Label(win, text="Input")    l.grid(row=0, column=0)    b = ttk.Button(win, text="Okay", command=win.destroy)    b.grid(row=1, column=0)def popup_showinfo():    showinfo("Window", "Hello World!")class Application(ttk.Frame):    def __init__(self, master):        ttk.Frame.__init__(self, master)        self.pack()        self.button_bonus = ttk.Button(self, text="Bonuses", command=popup_bonus)        self.button_bonus.pack()        self.button_showinfo = ttk.Button(self, text="Show Info", command=popup_showinfo)        self.button_showinfo.pack()root = tk.Tk()app = Application(root)root.mainloop()

BTW: I put it on page: Tkinter: How to create popup Window or Messagebox