>> I don't know too much about purpose of has_info & is_dirty,
>> but when we store something into session for later use we have info.
>>
>
> Maybe has_info() is really the wrong name here.  The way Quixote uses it,
> maybe the name should be is_worth_storing().  Applications may not wish to
> store sessions with certain combinations of 'info'.
>
>
If has_info is False then session will be deleted on next http request.
In current implementation of Quixote has_info is True when
self.user is set or self._form_tokens is not empty!

I suggest to check for self._items also (if we need to store objects into
session):
def has_info(self):
        return self.user or self._form_tokens or self._items



I see that is_dirty is not used in current implementation.