import bpy

#Rename of the selected objects
for obj in bpy.context.selected_objects:
    obj.name = 'Obj_name'
#Rename of the selected armature
for armature in bpy.data.armatures:
    armature.name = 'Armature_name'
    #Rename oof all bones
    for bone in armature.bones:
        bone.name = 'Bones_names'