Why self-defined session_key got changed when save in DB?

Hi,

I have following code to set self-defined session_key:

>>> from django.contrib.sessions.backends.db import SessionStore
>>> from django.contrib.sessions.models import Session
>>> a = SessionStore(session_key="fwefwejfo3j20jf02jnfweojfeo")
>>> a.save()
>>> a.session_key
'a6e020a64789b5644e923c85b80a1d0b'

Why the session_key got changed after saved in DB? Where is my defined
session_key?

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