func lstrip(self: PyStr): PyStr {....raises: [], tags: [], forbids: [].}

func lstrip(self: PyStr; chars: PyStr): PyStr {....raises: [], tags: [],
    forbids: [].}

func rstrip(self: PyStr): PyStr {....raises: [], tags: [], forbids: [].}

func rstrip(self: PyStr; chars: PyStr): PyStr {....raises: [], tags: [],
    forbids: [].}

func strip(self: PyStr): PyStr {....raises: [], tags: [], forbids: [].}

func strip(self: PyStr; chars: PyStr): PyStr {....raises: [], tags: [], forbids: [].}