nested loops

[anton muhin]

Oleg Leschov wrote:

> Could there be means of exiting nested loops in python?
> something similar to labelled loops in perl..
> 
> I consider it irrating to have to make a flag for sole
> purpose of checking it after loop if we need to break once more...
> 
> So maybe there should be an argument to break that is an int which is
> a number of loops to break. So it would default to 1 (or whatever means
> the current enclosing loop), not breaking any code...
> 
> Or maybe name the loops and give the loop name argument to break:
> for i in list as outerloop:
>     while 1:
>         <do something>
>         if u:
>             continue
>         elif v:
>             continue outerloop
>         elif w:
>             break
>         elif x:
>             break outerloop
> Or both.
> 
> Are there any cons to this proposal?
> 
> 
Not an ideal solution, but still might be of interest:

 >>> for x in range(100):
... 	print x
... 	for y in range(100):
... 		print '\t', y
... 		if y == 40:
... 			break
... 	else:
... 		continue
... 	break
...

Actually, I'd rather abstract these complicated loops into a generator, 
in my limited experience it's usually much simplier and clearer.

hth,
anton.