parameters: (self, key, value)
docstring: Add a user-defined tag.
docstring_summary: Add a user-defined tag.
docstring_tokens: Add a user - defined tag .
function: def Tag(self, key, value):
          """ Add a user-defined tag. """
          if not self._tags:
              self._tags = {}
          self._tags[key] = value
function_tokens: def Tag ( self , key , value ) : if not self . _tags : self . _tags = { } self . _tags [ key ] = value