How to get file name from session?

Question

Django

I have the following code:

session = request.session
self.file = session.get('admin_price_import_file')

I need to get the name of the file that was placed throughout the session.
If I specify so, I will get the name of the new file already serialized.
self.file.title
I'm not strong in sessions, tell me how to do it right.