interactive-shell

Note: This is somewhat a follow-up on the question: Tkinter - when do I need to call mainloop? Usually when using Tkinter , you call Tk.mainloop to run the event loop and ensure that events are properly processed and windows remain interactive without blocking. When using Tkinter from within an interactive shell, running the main loop does not seem necessary. Take this example: >>> import tkinter >>> t = tkinter.Tk() A window will appear, and it will not block: You can interact with it, drag it around, and close it. So, something in the interactive shell does seem to recognize that a window