Tk treeview column sort

Question

Is there a way to sort the entries in a Tk Treeview by clicking the column? Surprisingly, I could not find any documentation/tutorial for this.

Answer 1

madonius is right, but here you have the full example and a proper, understandable explanation

The answer provided by Sridhar Ratnakumar does not work in python3 (and apparently in python2.7): since the variable is passed by reference, all lambdas end up referring to the same, last, element in columns.

You just need to change this for loop:

for col in columns:
    treeview.heading(col, text=col, command=lambda _col=col: \
                     treeview_sort_column(treeview, _col, False))

And the same change has to be applied to the lambda function inside treeview_sort_column

So the complete solution would look like this:

def treeview_sort_column(tv, col, reverse):
    l = [(tv.set(k, col), k) for k in tv.get_children('')]
    l.sort(reverse=reverse)

    # rearrange items in sorted positions
    for index, (val, k) in enumerate(l):
        tv.move(k, '', index)

    # reverse sort next time
    tv.heading(col, text=col, command=lambda _col=col: \
                 treeview_sort_column(tv, _col, not reverse))

[...]
columns = ('name', 'age')
treeview = ttk.TreeView(root, columns=columns, show='headings')
for col in columns:
    treeview.heading(col, text=col, command=lambda _col=col: \
                     treeview_sort_column(treeview, _col, False))
[...]