PyGreSQL pg.error Exception

Hi to all!        In the documentation of the PyGreSQL module it is said that a 
pg.error exception is thrown when pg.connect or other pg functions cause an 
error. How can i get the value of the error? I have tried print pg.error in 
the except clause but i get only a _pg.error value...

For example:
try:        db = pg.connect( connection parameters);
except pg.error:        print pg.error;

This prints "_pg.error"...

Thanks in advance for your replies,

Denis