class_docstr: Set the remembers the order elements were added
class_docstr_tok: ["Set","the","remembers","the","order","elements","were","added"]
code: def __len__(self):
      return len(self.__map)
  
imports: import types
  import weakref
  from collections.abc import MutableSet
label_desc: Use image node_id 3 for calling the OrderedSet obj's underlying member method code with example usage: obj.__len__() and returns: len