def writeExtras(self):
        for i, action in enumerate(self.extraActions):
            descr = ""
            if action._descr:
                descr = action._descr
            # a repeatable action must be the last action in the list
            if action._repeat and i != len(self.extraActions) - 1:
                raise ValueError("Completer with repeat=True must be "
                                 "last item in Options.extraActions")
            self.file.write(escape(action._shellCode('', usage._ZSH)))
            self.file.write(' \\\n')
Write out completion information for extra arguments appearing on the
dataset/ETHPy150Open nlloyd/SubliminalCollaborator/libs/twisted/python/_shellcomp.py/ZshArgumentsGenerator.writeExtras