Script to apply constraint in a chain of bones just apply to 1 bone

[Santiago_Lovera]

Pose Bone - Update Viewport Selection?

From what I can see, you’re only selecting the bone, when you should also be setting the selected bone as the active bone. import bpy bpy.data.objects["Armature"].data.bones.active = bpy.data.objects["Armature"].data.bones["Bone.001"] bpy.data.objects["Armature"].data.bones["Bone.001"].select = True

mrs. RPaladin had the answer.