How to write this iterator?

[Cyril Bazin]

Ok!
Now, you wrote your expected results I understand better what you want to 
do...

Your solution seems fine except the "except IndexError:" part.
I would have wrote:

------------------------------------------
...
except IndexError:
if self.iters:
self.i=0
else:
raise StopIteration
...
-------------------------------------------

- Use the operator "==" if you want to compare values
- if you want to test if a list is empty, test the list itself not the 
length
- Also, prefer to use "while 1:" in place of "while True:" it's more 
optimised since 1 is a constant and True is not a constant (but using True 
works fine too)

Anyway, if you are really a python beginner, I should say your program is 
very good.

Cyril


On 9/20/05, severa at sophia.dtp.fmph.uniba.sk <severa at sophia.dtp.fmph.uniba.sk> 
wrote:
> 
> >> Sorry, my description was not very good, I meant something behaving as:
> >>
> >> >>>example=Liter("abc","12345","XY")
> >> >>>for x in example: print x,
> >>
> >> a 1 X b 2 Y c 3 4 5
> >>
> >> or for that append() method,
> >>
> >> >>>example=Liter("abc", "12345")
> >> >>>for i in range(3): print example.next(),
> >>
> >> a 1 b
> >>
> >> >>>example.append("XY")
> >> >>>for x in example: print x,
> >>
> >> 2 c X 3 Y 4 5
> 
> >Check the module I posted on
> >http://rafb.net/paste/results/CRT7bS68.html. append() makes things more
> >complicated -- mainly because generators don't accept attributes, so it
> >has to be wrapped in a class -- but the simple generator (without
> >append) is more manageable
> 
> Thank you very much for your solution. Actually I needed that append()
> method quite a lot, so maybe my solution (posted at the beginning of this
> thread) was not that stupid :) (to inflate my ego a bit)
> 
> Anyway, this is roughly what I used it for; is it a sane use of iterators?
> 
> I was looking for the Holy Grail. I had an iterator 'quest' that produced
> either junk that was to be thrown away, or the Holy Grail itself, or
> another iterator of the same kind (that had to be searched for the Holy
> Grail as well). The iterators were potentially infinite. The code was
> rougly:
> 
> quest=Liter(quest)
> for x in quest:
> if is_Holy_Grail(x):
> share_and_enjoy(x)
> break
> elif is_another_iterator(x):
> quest.append(x)
> 
> 
> Best regards
> P.
> 
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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