I'm trying to change the selection mode from SET to ADD (or any other mode using python). In the ui this is easy to do by clicking on these toolbar icons:
I've tried this but it's not working.
bpy.ops.view3d.select_box(xmin=0, xmax=0, ymin=0, ymax=0, wait_for_input=True, mode='ADD')
Does anyone know how to do the equivalent of clicking on the add button 
in the toolbar using python?
Thanks
Change tool property values for operators
# This script does not check anything
# You may need to check:
# Current workspace has a 3D viewport
# Whether the header is hidden
import bpy
ws = bpy.context.workspace
tool = ws.tools["builtin.select_box"]
p = tool.operator_properties("view3d.select_box")
p.mode = "ADD"
# Refresh UI
for a in bpy.context.screen.areas:
a.tag_redraw()
