Message3135

What's odd about the patch for #1768970 (use __getitem__ in the iter) is 
that we have to catch KeyErrors to work on Jython (without the catch 
iterating lists doesn't work correctly)

Whereas CPython actually allows KeyErrors to propagate through the 
iterator. I guess CPython is avoiding this by defining different 
iterators for builtins (e.g. list has its own listiterator type)

Python 2.5.1 (r251:54863, Aug 19 2007, 21:02:30) 
[GCC 4.0.1 (Apple Computer, Inc. build 5367)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> class Foo(object):
...     def __getitem__(self, i):
...             raise KeyError
... 
>>> iter(Foo()).next()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<stdin>", line 3, in __getitem__
KeyError

with the patch:
Jython 2.3a0 on java1.5.0_13
Type "copyright", "credits" or "license" for more information.
>>> class Foo(object):
...     def __getitem__(self, i):
...             raise KeyError
... 
>>> iter(Foo()).next()
Traceback (innermost last):
  File "<console>", line 1, in ?
StopIteration: