Someone pasted the original version of the following code snippet on
#python today. I started investigating why the new-style class didn't
work as expected, and found that at least some instances of new-style
classes apparently don't return true for PyInstance_Check, which causes
a problem in PySequence_Check, since it will only do an attribute lookup
for instances.
Things probably shouldn't be this way. Should I go to python-dev with this?
Demonstration snippet:
args={'a':0}
class Args(object):
def __getattr__(self,attr):
print "__getattr__:", attr
return getattr(args,attr)
class ClassicArgs:
def __getattr__(self, attr):
print "__getattr__:", attr
return getattr(args, attr)
if __name__ == '__main__':
c = ClassicArgs()
i = c.__iter__()
print i
i = iter(c)
print i
a = Args()
i = a.__iter__()
print i
i = iter(a)
print i
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