The Python 2.3 support removal of r7457 also removed the `py_groupby` that should be used as the `groupby` method in templates, as the `itertools.groupby` may leak for Python 2.4 and Python 2.5 (see r6637).
Authored by: cboos 2008-10-29
Parent: [r7628]
Child: [r7630]
