MenuButton in tkinter Python

Question

While creating a proper menu we use many statements and one of the statements is :
menubutton["menu"] = menubutton.menu

What is the significance of this statement ? Does the "menu" in square brackets can be replaced by any identifier ?
https://code.sololearn.com/clGX1oTmXtfS

(This code has used many times menu keyword but I am not able to understand the significance of each one as some of them are explained online but some of them are just written)

Answer 1

Diego please see this.

Answer 2

It basically enables the dropdown menu. Remove that part and see what happens.

It can't be repacled by any identifier. It needs to be ["menu"].

https://stackoverflow.com/questions/44822870#44824611