'A user-modifiable dictionary.
The initial value of this dictioanry can be populated using the
``info`` argument to the :class:`.Session` constructor or
:class:`.sessionmaker` constructor or factory methods.  The dictionary
here is always local to this :class:`.Session` and can be modified
independently of all other :class:`.Session` objects.
.. versionadded:: 0.9.0'

@util.memoized_property
def info(self):

    return {}
