Re: [Python-ideas] suggestion for try/except program flow

March 28, 2009


      On Sat, Mar 28, 2009 at 5:06 AM, Mark Donald <foobarmus@gmail.com> wrote:
...
In this situation, which happens to me fairly frequently...
try:
 try:
    raise Cheese
 except Cheese, e:
    # handle cheese
    raise
except:
 # handle all manner of stuff, including cheese
...it would be nice (& more readable) if one were able to recatch a
named exception with the generic (catch-all) except clause of its own
try, something like this:
try:
 raise Cheese
except Cheese, e:
 # handle cheese
 recatch
except:
 # handle all manner of stuff, including cheese
I'm not sure recatch is all that more reasonable -- it's another
fairly obscure control flow verb. I think the current situation isn't
so bad. Nick already pointed out an idiom for doing this without two
try clauses:

except BaseException as e:
  if isinstance(e, Cheese):
    # handle cheese
  # handle all manner of stuff, including cheese

-- 
--Guido van Rossum (home page: http://www.python.org/~guido/)