I wonder why iterators do have an __iter__() method? I thought
iterable objects would have an __iter__() method (but no __next__())
to create an iterator for it, and that would have the __next__()
method but no __iter__().
$ python3
Python 3.5.2 (default, Nov 12 2018, 13:43:14)
[GCC 5.4.0 20160609] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> l = [1,2,3]
>>> next(l)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: 'list' object is not an iterator
This is expected, of course.
>>> iter(l)
<list_iterator object at 0x7f2e271d1fd0>
>>> iter(iter(l))
<list_iterator object at 0x7f2e278f5978>
>>> iter(iter(iter(l)))
<list_iterator object at 0x7f2e271d1fd0>
>>> i = iter(iter(iter(l)))
>>> list(i)
[1, 2, 3]
Is there any reason or usage for this?
Steve
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