propapating exceptions

[Quinn Dunkan]

I've lately found myself in the position of wanting to catch exceptions
based on their attributes, rather than on the exception itself.  So (in
mal's odbc module):

try:
	some sql command
except ODBC.MySQL.OperationalError, msg:
	if msg[1] == CR_SERVER_GONE_ERROR: # (snarfed out of errmsg.h)
		restart server, try again
	else:
		raise sys.exc_info()[0], sys.exc_info()[1]

It's a rather wordy way to pass the exception on without touching it,
and I still lose the traceback info.  Is there a better way to pass on
an exception as if it had never been caught?