How can I build a range slider from which I can get the range of two values, e.g., min and max? The scale widget seems not meet this requirement. I can only get one value from it and I don't want to use two scale to do this. 
Thanks
You could create one by drawing the individual parts of the widget on a canvas. It's pretty easy to add bindings for dragging things around.
How to build a range slider using tkinter?