Delete unweighted, unused vertex groups

Only made this thread so I could easily find this trick in the future.

Credits to this thread:
https://blenderartists.org/t/batch-delete-vertex-groups-script/449881/22

According to the comments in the thread, the plugin doesn't work by itself in Blender 3.0 anymore, but running the script in the text editor of Blender does work as confirmed by me.

Before you run the script, select the object from which you want the unweighted vertex groups removed.

Here is the code:

import bpy
from bpy.types import Operator

ob = bpy.context.object
ob.update_from_editmode()
   
vgroup_used = {i: False for i, k in enumerate(ob.vertex_groups)}
   
for v in ob.data.vertices:
    for g in v.groups:
        if g.weight > 0.0:
            vgroup_used[g.group] = True
   
for i, used in sorted(vgroup_used.items(), reverse=True):
    if not used:
        ob.vertex_groups.remove(ob.vertex_groups[letter i])

And here is it, but it works with multiple objects selected:

import bpy
from bpy.types import Operator

# Loop over all selected objects
for ob in bpy.context.selected_objects:
    # Check if the object is a mesh
    if ob.type == 'MESH':
        ob.update_from_editmode()

        vgroup_used = {i: False for i, k in enumerate(ob.vertex_groups)}

        for v in ob.data.vertices:
            for g in v.groups:
                if g.weight > 0.0:
                    vgroup_used[g.group] = True

        for i, used in sorted(vgroup_used.items(), reverse=True):
            if not used:
                ob.vertex_groups.remove(ob.vertex_groups[letter i])

Note that change the "letter i" sections to just i, I can't put the square brackets because it formats the text to italian and deletes the part of the code.

[Artiko240]

True

[_MaZ_TeR_]

The better question is, why not?

[Artiko240]

why the cat

[N7Legion]

I have a different script, which is a lot easier to remove the unused vertex groups with a button. Can be easily located under Data > Vertex Groups > Special menu

https://cdn.discordapp.com/attachments/488722739922993152/1141257827520872488/Remove_unused_vertex_groups.py