[Tkinter] Is mainloop() necessary?

[escape_freedom13]

IDLE is written in tkinter, running tkinter code in IDLE will use idle's mainloop.
Best advice is not to use IDLE for tkinter code.

Edit: yes mainloop is necessary.

Thank you .....
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Thank you for arranging my first post and sending 'How To Arrange' link.....

Thank you for solving the problem .....

It worked!

I hadn't any idea that IDLE is written in tkinter and codes are using it's mainloop().

Thanks Man!