parameters: (self, key, value)
docstring: Used internally by the accessor properties.
docstring_summary: Used internally by the accessor properties.
docstring_tokens: Used internally by the accessor properties .
function: def _set_value(self, key, value):
          """Used internally by the accessor properties."""
          if value is None:
              self.pop(key, None)
          else:
              self[key] = value
function_tokens: def _set_value ( self , key , value ) : if value is None : self . pop ( key , None ) else : self [ key ] = value