How to group KiCad tracks created in python

kicad_group_example.py

"""
When creating a lot of board features (tracks, vias, etc) from a python script,
grouping them allows them to be easily selected together in pcbnew. This can be
useful if, for exampe, you want to move them together after generating, or if
you find yourself iterating and need to delete the old tracks each time before
re-running the script.

Luckily, it's easy to create a group and assign it to elements as they are
created in python; here's a quick example.
"""

import pcbnew

def pcbpoint(p):
    return pcbnew.wxPointMM(float(p[0]), float(p[1]))

# Get the board. This assume you are running in pcbnew with a board already 
# open. It's also possible to use LoadBoard to open a .kicad_pcb file.
board = pcbnew.GetBoard()

# Create a new group, and add it to the board
group = pcbnew.PCB_GROUP(board)
board.Add(group)

# Create a new element, and add it to the group (as well as the board)
track = pcbnew.PCB_TRACK(board)
track.SetStart(pcbnew.wxPointMM(100, 100))
track.SetEnd(pcbnew.wxPointMM(100, 110))
track.SetWidth(int(0.2 * 1e6))
track.SetLayer(pcbnew.F_Cu)
board.Add(track)
group.AddItem(track)