Why Does Closing A Tkinter Child Window With `frame.quit` Exit My Application?

I have a tkinter application with two windows: A MainWindow that is created on startup, and a ChildWindow which is opened after clicking a button. The ChildWindow should close itse

Solution 1:

It is because quit causes mainloop to exit. With no event loop running, there's nothing left to keep the main window alive.

If you want to close a child window, call the destroy method.

self.close_button = tk.Button(..., command=self.top.destroy)