Errors and warnings

Is it possible to tell errors form warnings when working with SQL
Server? There are some warnings (eg null value eliminated from
aggregate) that I want to ignore. This could be based on the severity
level of the message. Something like:

def _servermsg_cb(ctx, conn, msg):
    #if msg.msgnumber not in (5701, 5703):
    if msg.severity:
        raise DatabaseError(_fmt_server(msg))

If not, it is not possible to execute 'sp_help mytable' on a table that
has no views. It is funny that the program never ends, it hangs.

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