Zope Object Database (ZODB)
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The Zope Object Database is a fullfledged object database for
arbitrary (Python) objects, including content, templates and scripts.
The ZODB has full transactional support, so your data is safe.

Zope ships with the ZODB out of the box -- no database setup
needed. You don't have to interface your code with a relational
database to store data if you don't need to -- you can store the
Python objects directly, no relational database needed. Of course,
Zope supports those as well.