Stretching Frames Using Grid Layout In Python Tkinter

I'm trying to get stretching to work using Python 2.6.7 with Tkinter. I'd expect the below code to stretch the first button to the width of the second, but both buttons are only as

Solution 1:

If you want widgets to line up in a grid, the first thing to do is make sure they have the same parent. This isn't strictly necessary if all the widgets are the same size or you are only using one column.

Another thing you need to do is give your column a weight. What is happening in your code is that the widget is expanding to fill the column, but the column isn't expanding to fill the master. If you give it a weight of 1 it will. You ned to do something like inner_a.columnconfigure(1, weight=1), and then do likewise for inner_b.