parameters: (self)
return_statement: return len(self._data)
docstring: Return the number of elements of a set.
docstring_summary: Return the number of elements of a set.
docstring_tokens: Return the number of elements of a set .
function: def __len__(self):
          """Return the number of elements of a set."""
          return len(self._data)
function_tokens: def __len__ ( self ) : return len ( self . _data )