parameters: (self)
return_statement: return len(self.items)
docstring: Returns the number of unique elements in the ordered set
  
          Example:
              >>> len(OrderedSet([]))
              0
              >>> len(OrderedSet([1, 2]))
              2
docstring_summary: Returns the number of unique elements in the ordered set
docstring_tokens: Returns the number of unique elements in the ordered set
function: def __len__(self):
          """
          Returns the number of unique elements in the ordered set
  
          Example:
              >>> len(OrderedSet([]))
              0
              >>> len(OrderedSet([1, 2]))
              2
          """
          return len(self.items)
function_tokens: def __len__ ( self ) : return len ( self . items )