propapating exceptions

[Michael P. Reilly]

Quinn Dunkan <quinn at lira.ugcs.caltech.edu> wrote:
: 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?

In Python 1.5, using "raise" by itself will reissue the exception with
the same value.  Fortunately (or unfortunately), the traceback does not
seem to be modified.

  -Arcege