nested loops

[Cameron Laird]

In article <slrnboa6hf.kf.alf at largo.fayauffre.org>,
Alexandre Fayolle  <alexandre.fayolle at logilab.fr> wrote:
>Dans l'article <bm3sar$7e3$4 at ocasysi.rubbernet.net>, Oleg Leschov a écrit :
>> 
>> Could there be means of exiting nested loops in python?
>
>Raising a dedicated exception can do the trick.
>
>class NestedLoopExit(Exception):
>    pass
>
>def somefun(aList, aCond, anotherList):
>    try:
>        for e in eList:
>            for e2 in anotherList:
>	        if aCond:
>                    raise NestedLoopExit
>                else:
>                    do_something_useful()
>    except NestedLoopExit:
>        pass
			.
			.
			.
As some of us are working in other-than-our-native languages, I
want to reinforce Mr. Fayolle's observation explicitly:  use of
such an exception is not only an alternative to the "labelled
break" Mr. Leschov originally sought, it's the one I consider
most idiomatic in Python.  Exceptions are important in Python;
make their acquaintance.
-- 

Cameron Laird <claird at phaseit.net>
Business:  http://www.Phaseit.net