Is there a way to change the active texture in texture paint mode using Python?

Question

Is there a way to access the variable that is responsible for the active texture of a certain material for texture painting and change it? It is better to use the image variable itself and not an index. Apart from that, I would like to know if there is a way to set the color for all the tools in texture paint mode instead of just the active one or to prevent their use.

Answer 1

The active texture in texture paint is given by:

bpy.data.materials['Material'].paint_active_slot

It is modifiable.

And the active material for an object o is:

o.active_material

or its index:

o.active_material_index

You can of course combine the two:

o.active_material.paint_active_slot

PS:

Blender indicates all that hovering its menus:

And:

These tooltips are available if you activate "Python tooltips" in the preferences:

---

Complement to get the max possible image slot index, for a given material:

import bpy

# get the object
o = bpy.context.object

# get active mat (or the one you want)
mat = o.active_material

# catch nodes of type image texture
images = set(m.image for m in mat.node_tree.nodes if m.type == 'TEX_IMAGE' and m.image is not None)

# get the max index for this material
max_index = len(images) - 1