New submission from Alexandre Vassalotti <[EMAIL PROTECTED]>:
There is currently a pickling bug in the namedtuple factory:
>>> from collections import namedtuple
>>> MemoRecord = namedtuple("MemoRecord", "key, msg")
>>> m = MemoRecord(1,"hello")
>>> import pickle
>>> pickle.loads(pickle.dumps(m))
Traceback (most recent call last):
...
TypeError: __new__() takes exactly 3 positional arguments (2 given)
The bug is due to the fact that classes created by namedtuple don't
handle the __new__ arguments in the same fashion as tuple.__new__. The
fix is simply to define __getnewargs__.
----------
assignee: rhettinger
components: Library (Lib)
files: fix_namedtuple_pickling.patch
keywords: patch, patch
messages: 67853
nosy: alexandre.vassalotti, rhettinger
priority: normal
severity: normal
status: open
title: Fix pickling bug of collections.namedtuple
type: behavior
versions: Python 2.6, Python 3.0
Added file: http://bugs.python.org/file10558/fix_namedtuple_pickling.patch
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Python tracker <[EMAIL PROTECTED]>
<http://bugs.python.org/issue3065>
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