'Append STRING to the Tk clipboard.
A widget specified at the optional displayof keyword
argument specifies the target display. The clipboard
can be retrieved with selection_get.'

def clipboard_append(self, string, **kw):

    if ('displayof' not in kw):
        kw['displayof'] = self._w
    self.tk.call(((('clipboard', 'append') + self._options(kw)) + ('--', string)))
