[docs] [issue10410] Is iterable a container type?
report at bugs.python.org
Sun Nov 14 00:51:25 CET 2010
Raymond Hettinger <rhettinger at users.sourceforge.net> added the comment:
> "iterable" is described as "A container object
> capable of returning its members one at a time."
That wording is confusing. I'll fix it.
> Likewise, "and objects of any classes you define
> with an __iter__() or __getitem__() method." is
> wrong because __getitem__ method is not relate to
That wording is correct. Sequences are automatically
iterable even if they don't define __iter__. For example:
>>> class A:
... def __getitem__(self, i):
... if i > 10:
... raise IndexError(i)
... return i * 100
[0, 100, 200, 300, 400, 500, 600, 700, 800, 900, 1000]
If you're curious, the details are in the PyObject_GetIter() function in http://svn.python.org/view/python/branches/release27-maint/Objects/abstract.c?view=markup .
priority: normal -> low
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