Delete all groups in blend file.
BlendDataGroups.remove(...)
import bpy
for g in bpy.data.groups:
bpy.data.groups.remove(g)
remove all empty groups (no objects assigned) from blend file
empty_groups = [g for g in bpy.data.groups if not g.objects]
while empty_groups:
bpy.data.groups.remove(empty_groups.pop())
Note: For my current version (2.79.4) there are some extra options all set to True
by default to "force the issue" without having to unlink and unset users.
>>> bpy.data.groups.remove(
remove()
BlendDataGroups.remove(group, do_unlink=True, do_id_user=True, do_ui_user=True)
Remove a group from the current blendfile
See also.
Proper way to remove unused linked Group data-blocks