[pyar] Es esto un bug en Python? multiprocessing.Manager

[Juanjo Conti]

Encontré un comportamiento que me sorprendió en multiprocessing.Manager. No
se puede iterar sobre el objeto proxy que representa un dict (objeto
compartido entre procesos).

>>> from multiprocessing import Manager
>>> m = Manager()
>>> d = m.dict()
>>> d
<DictProxy object, typeid 'dict' at 0x98a240c>
>>> for x in d:
...     print x
...
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<string>", line 2, in __getitem__
  File "/usr/lib/python2.6/multiprocessing/managers.py", line 740, in
_callmethod
    raise convert_to_error(kind, result)
KeyError: 0
>>> d['a'] = 1
>>> for x in d:
...     print x
...
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<string>", line 2, in __getitem__
  File "/usr/lib/python2.6/multiprocessing/managers.py", line 740, in
_callmethod
    raise convert_to_error(kind, result)
KeyError: 0
>>> d[1] = 1
>>> for x in d:
...     print x
...
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<string>", line 2, in __getitem__
  File "/usr/lib/python2.6/multiprocessing/managers.py", line 740, in
_callmethod
    raise convert_to_error(kind, result)
KeyError: 0
>>> for x in d.keys():
...     print x
...
a
1
>>> d = m.dict()
>>> for x in d.keys():
...     print x

Les parece un error o una feature?

Por si se preguntan, con listas si anda:

>>> l = m.list()
>>> for x in l:
...     print x
...

-- 
Juanjo Conti
blog: http://www.juanjoconti.com.ar
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