'reconfigure the :class:`.sessionmaker` used by this
:class:`.scoped_session`.
See :meth:`.sessionmaker.configure`.'

def configure(self, **kwargs):

    if self.registry.has():
        warn('At    least    one    scoped    session    is    already    present.        configure()    can    not    affect    sessions    that    have    already    been    created.')
    self.session_factory.configure(**kwargs)
