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:
pass
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).
~Ethan~
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