Readable Persistance?

[Chris S.]

I'm trying to write programs that make use of a lot of dynamic 
structures. To aid in debugging and data extraction, I'd like to persist 
these objects in a form that's readable, but one that also preserves 
handles (ie for lambda expressions, dictionaries, lists, etc). Using the 
pickle module, I can more-or-less accomplish the latter, but not the 
former. YAML can accomplish the former to some degree, but still can't 
represent handles. I understand the inherent difficulties in 
representing complex objects in a human readable format, but is there 
any way to do this with Python? Any help is appreciated.