[PyGreSQL] How to get error codes (SQLSTATE) with PyGreSQL?

[Christoph Zwerschke]

The PostgreSQL doco says "Applications that need to know which error 
condition has occurred should usually test the error code, rather than 
looking at the textual error message."

Is it possible to check the error code (SQLSTATE) with PyGreSQL? If not, 
how difficult is it to implement this?

-- Christoph
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