code: def set_textarea(self, data):
          
          for (name, value) in data.items():
              t = self.form.find("textarea", {"name": name})
              if not t:
                  raise InvalidFormMethod("No textarea named " + name)
              t.string = value
docs: Set the *string*-attribute of the first textarea element
          specified by ``data`` (i.e. set the text of a textarea).
  
          :param data: Dict of ``{name: value, ...}``.
              The textarea whose *name*-attribute is ``name`` will have
              its *string*-attribute set to ``value``.