code: def new(cls, package, slide_part):
          
          notes_master_part = package.presentation_part.notes_master_part
          notes_slide_part = cls._add_notes_slide_part(
              package, slide_part, notes_master_part
          )
          notes_slide = notes_slide_part.notes_slide
          notes_slide.clone_master_placeholders(notes_master_part.notes_master)
          return notes_slide_part
docs: Create and return a new notes slide part based on the notes master
          and related to both the notes master part and *slide_part*. If no
          notes master is present, create one based on the default template.