So when rebuilding python-genshi in rawhide with python 2.6.2 we hit a problem
running it's test suite. Come to find out, this is due to some behavioral
changes in 2.6.2 with regard to iterators and __length_hint__.
http://koji.fedoraproject.org/koji/getfile?taskID=1671970&name=build.log
This is the class and doctest that was causing problems::
class Undefined(object):
"""Represents a reference to an undefined variable.
>>> foo = Undefined('foo')
>>> list(foo)
[]
"""
def __iter__(self):
return iter([])
def _die(self, *args, **kwargs):
__traceback_hide__ = True
raise UndefinedError(self._name, self._owner)
__call__ = __getattr__ = __getitem__ = _die
When tweaking the class a little and running the tests again:
python-2.4.3-27.el5
Failed example: list(foo)
Expected: []
Got:
Undefined.__iter__
[]
python-2.6.2-2.fc12.i686
Failed example: list(foo)
Expected: []
Got:
Undefined.__iter__
__getattr__(('__length_hint__',))
[]
So, it looks like list(foo) calls foo.__iter__ and then calls
foo.__getattr__('__length_hint__'). Since Genshi's Undefined class overrides
__getattr__, this triggers some unexpected behavior.
This issue was filed upstream, where I attached a patch, which I built in
rawhide.
http://genshi.edgewall.org/ticket/324
I believe this behavior was introduced in http://bugs.python.org/issue1242657
We will want to keep a lookout for similar problems in other places when
rebuilding our python modules again python 2.6.2
luke
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