I need to add a popup dialog box on my GUI. 
So, when ever I hover my mouse over a label, it should be able to show a popup( Like the type we get while hovering over a file in windows).
It should also disappear as soon i move away the mouse.
To start with, I am not even sure which module or class to use. I tried menu, but the results are not what i expected.
I also tried to learn tkCommonDialog, but couldn't understand it properly.
Please Advice!
Take a look at the Balloon widget in the Tix package. I think it is just what you are looking for.
Popup Dialog in Tkinter/Python