On Tue, Nov 05, 2002, Just van Rossum wrote:
> Just van Rossum wrote:
>>
>> class Outer:
>> [snip snip]
>> def __iter__(self):
>> while not self.isAtEnd():
>> result = self.outer.currentState()
>> self.outer.advanceState()
>> yield result
>
> PS, getting more off-topic, I'm somewhat surprised that the above is more
> compact and readable than the obvious generator-less equivalent:
>
> class Outer:
> [snip snip]
> def __iter__(self):
> return self
> def next(self):
> if self.isAtEnd():
> raise StopIteration
> else:
> result = self.outer.currentState()
> self.outer.advanceState()
> return result
Hmmmm... I'm surprised that you're surprised. Here's my slide from
OSCON2002:
Generators simpler
No need to explicitly maintain state
Iterators more controllable
Can manipulate internal state (e.g., __del__ method on iterator
object to handle cleanup)
Can be backported to older versions of Python
Generally speaking, I can think of few reasons to build an actual
iterator class rather than a generator.
--
Aahz (aahz@pythoncraft.com) <*> http://www.pythoncraft.com/
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