class_docstr: For use within the 'within_subsection_order' key.
class_docstr_tok: ["For","use","within","the","'within_subsection_order","'","key","."]
docstr: Return a string determining the sort order.
docstr_tok: ["Return","a","string","determining","the","sort","order","."]
code: def __call__(self, item):
      """Return a string determining the sort order."""
      if item in self.ordered_list:
          return f"{self.ordered_list.index(item):04d}"
      else:
          # ensure not explicitly listed items come last.
          return "zzz" + item
  
imports: from sphinx_gallery.sorting import ExplicitOrder
label_desc: Use image node_id 2 for calling the MplExplicitSubOrder obj's underlying member method code with example usage: obj.__call__(item) and returns: self, unknown