How to use the internetarchive.session function in internetarchive

def session(cls, set_to=None):
        """Keep one ArchiveSession object for the whole program.

        The session doesn't seem to keep any state so this should be
        fine.
        """
        if set_to:
            cls._session = set_to
        if not cls._session:
            cls._session = ia.session.ArchiveSession()
        return cls._session

def session(cls, set_to=None):
        """Keep one ArchiveSession object for the whole program.

        The session doesn't seem to keep any state so this should be
        fine.
        """
        if set_to:
            cls._session = set_to
        if not cls._session:
            cls._session = ia.session.ArchiveSession()
        return cls._session

def session(cls, set_to=None):
        """Keep one ArchiveSession object for the whole program.

        The session doesn't seem to keep any state so this should be
        fine.
        """
        if set_to:
            cls._session = set_to
        if not cls._session:
            cls._session = ia.session.ArchiveSession()
        return cls._session