How to improve my python file manager?

I have written a simple python program which will act as a simple file manager. But as I am new to it, I don’t know much of functions. I want to add functions like that to back to an option and if possible converting files to zip.
I have posted it in this page though.
Simple Python file manager
I am not advertising anything. I just want to make it better for the visitors. So, please help me.

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