Toplevel in Tkinter: Prevent Two Windows from Opening

Question

Say I have some simple code, like this:

from Tkinter import *
root = Tk()
app = Toplevel(root)
app.mainloop()

This opens two windows: the Toplevel(root) window and the Tk() window.

Is it possible to avoid the Tk() window (root) from opening? If so, how? I only want the toplevel. I want this to happen because I am making a program that will have multiple windows opening, which are all Toplevel's of the root.

Thanks!

Answer 1

The withdraw() method removes the window from the screen.
The iconify() method minimizes the window, or turns it into an icon.
The deiconify() method will redraw the window, and/or activate it.

If you choose withdraw(), make sure you've considered a new way to exit the program before testing.
e.g.

from Tkinter import * # tkinter in Python 3

root = Tk()
root.withdraw()

top = Toplevel(root)
top.protocol("WM_DELETE_WINDOW", root.destroy)

but = Button(top, text='deiconify')
but['command'] = root.deiconify
but.pack()

root.mainloop()

The protocol() method can be used to register a function that will be called when the
Toplevel window's close button is pressed. In this case we can use destroy() to exit.