[docs] [issue11988] special method lookup docs don't address some important details

[Eric Snow]

Eric Snow <ericsnowcurrently at gmail.com> added the comment:

In 2.7 I get the following (if Y does not inherit from object):

>>> print('res:', 1 in y)
('X contains:', 1)
('res:', False)

This makes sense with old style classes.  With Y(object):

>>> print('res:', 1 in y)
Y iter
('res:', True)

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nosy: +ericsnow

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue11988>
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