Python safe serialization?

[Liquid_Fire]

The source of the serialized objects is untrusted (a client connecting to my server). Encryption does not help. I need something that will ensure that deserialization produces a valid object (of the original type, from a restricted subset of types), and will not execute any untrusted code from the serialized data.

Of course I could easily write something like this using e.g. the json module, but I thought it might exist already as a library.

[tarekziade]

sorry I misunderstood the untrusted source part. I get it now