ethan at stoneleaf.us
Tue Dec 18 00:27:47 CET 2012
Dave Angel wrote:
> On 12/17/2012 09:33 AM, Skip Montanaro wrote:
>> What method(s) does a class have to support to properly emulate a container
>> which supports turning it into a list? For example:
>> class Foo:
>> f = Foo()
>> print list(f)
>> Is it just __iter__() and next()? (I'm still using 2.4 and 2.7.)
> I believe the container class needs to define the __iter__() method,
> which has to return an iterator object.
> That (possibly different) iterator class needs both an __iter__() method
> and a next() method.
> If the container class is also the iterator class, which is common, then
> you just need one __iter__() method, which returns self.
The `next()` method is also needed, as `__iter__()` and `next()` are the two methods that make up
the iterator protocol (`__next__` in python 3k).
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