assert postgres_select: result.status.is_ok else print_error db.error
assert postgres_ntuples: result.ntuples == 2 else print_error db.error
assert postgres_nfields: result.nfields == 3 else print_error db.error
assert postgres_fname: result.fname(0) == "aname" else print_error db.error
assert postgres_select: result.status.is_ok else print_error db.error
assert postgres_ntuples: result.ntuples == 2 else print_error db.error
assert postgres_nfields: result.nfields == 3 else print_error db.error
assert postgres_fname: result.fname(0) == "aname" else print_error db.error