[Tkinter] Why does the image for the button not appear?

[Yoriz]

Using global is not a good way to fix it
If you don't want to use classes which is a better way of organising GUI code where you could keep a reference to the image as an attribute of the class instance, you could do the following.

deposit_exit_button_photo = PhotoImage(file = r"Z:\Finley\School\Sixth Form\School Images\CS\exit.png")
deposit_exit_button = Button(deposit_page, text="", image = deposit_exit_button_photo, command = exit_menu)
deposit_exit_button.image = deposit_exit_button_photo

To keep a reference to it on the button object.

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Also see Namespace flooding with * imports