I'm implementing a recursive upsert operation for an object whose primary 
key also contains a foreignkey, and I'd like to get some more info from 
IntegrityError, namely whether integrity was violated because the 
foreignkey didn't exist (yet) or I am trying to insert a duplicate pkey. In 
the former case, I'd go and insert the parent, in the latter, I'd just 
ignore it and rollback (since the state is already end state)

Is there a way to fish this out from IntegrityError or do I need to catch 
DBAPI exceptions instead?

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SQLAlchemy - 
The Python SQL Toolkit and Object Relational Mapper

http://www.sqlalchemy.org/

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