How to create equal-width columns in Python 2.7 with Tkinter
To make a gridded layout have all columns have the same width, you've got to configure those columns to have the same weight and to be in the same uniform group. This configuration is associated with the master widget, not any of the contained widgets (because columns can contain many widgets, of course).
In standard Tk, this is done with:
# "fred" is just some arbitrary key; it means nothing other than to name the groupgrid columnconfigure $master 0 -weight 1 -uniform fredIn Tkinter (note that uniform seems to be not documented in the docstring but it is exactly what you need):
# "fred" is just some arbitrary key; it means nothing other than to name the groupmaster.grid_columnconfigure(0, weight=1, uniform="fred")Then repeat for the other column indices that you want to set things for. (As you can see, the code's very similar in these two cases.)