Path: csiph.com!newsfeed.hal-mli.net!feeder3.hal-mli.net!newsfeed.hal-mli.net!feeder1.hal-mli.net!newsfeed.xs4all.nl!newsfeed4.news.xs4all.nl!xs4all!newsgate.cistron.nl!newsgate.news.xs4all.nl!post.news.xs4all.nl!not-for-mail Return-Path: X-Original-To: python-list@python.org Delivered-To: python-list@mail.python.org X-Spam-Status: OK 0.001 X-Spam-Evidence: '*H*': 1.00; '*S*': 0.00; 'argument': 0.05; 'error:': 0.07; 'referring': 0.07; 'result,': 0.07; 'string': 0.09; '-1)': 0.09; 'function:': 0.09; 'loaded,': 0.09; 'obj': 0.09; 'received:80.91': 0.09; 'received:80.91.229': 0.09; 'received:gmane.org': 0.09; 'received:list': 0.09; 'django': 0.11; '(it': 0.16; 'a(object):': 0.16; 'effect.': 0.16; 'files)': 0.16; 'guys,': 0.16; 'hasattr(obj,': 0.16; 'means.': 0.16; 'received:80.91.229.3': 0.16; 'received:dip0.t-ipconnect.de': 0.16; 'received:plane.gmane.org': 0.16; 'received:t-ipconnect.de': 0.16; 'set,': 0.16; 'sockets': 0.16; 'subject:class': 0.16; 'subject:object': 0.16; 'subject:type': 0.16; 'tuple,': 0.16; 'typeerror:': 0.16; 'wrote:': 0.18; 'hey': 0.18; 'module': 0.19; 'trying': 0.19; 'slightly': 0.19; '>>>': 0.22; 'import': 0.22; 'issue.': 0.22; 'load': 0.23; 'header:User-Agent:1': 0.23; 'error': 0.23; '(such': 0.24; 'helpful': 0.24; "haven't": 0.24; 'long,': 0.26; 'skip:" 30': 0.26; 'pass': 0.26; 'header:X -Complaints-To:1': 0.27; 'tried': 0.27; "i'm": 0.30; 'code': 0.31; "skip:' 10": 0.31; '"",': 0.31; 'fine,': 0.31; 'int,': 0.31; 'loads': 0.31; 'pickle': 0.31; 'produces': 0.31; 'file': 0.32; 'class': 0.32; 'run': 0.32; 'another': 0.32; '(most': 0.33; 'guess': 0.33; 'monday,': 0.33; 'maybe': 0.34; 'problem': 0.35; 'classes': 0.35; 'skip:u 20': 0.35; 'something': 0.35; 'objects': 0.35; 'but': 0.35; 'leads': 0.36; 'doing': 0.36; 'thanks': 0.36; 'hi,': 0.36; 'should': 0.36; 'being': 0.38; 'problems': 0.38; 'skip:[ 10': 0.38; 'to:addr:python-list': 0.38; 'list,': 0.38; 'that,': 0.38; 'recent': 0.39; 'to:addr:python.org': 0.39; 'received:org': 0.40; 'even': 0.60; 'skip:u 10': 0.60; 'temporarily': 0.60; 'most': 0.60; 'simple': 0.61; 'here:': 0.62; 'name': 0.63; 'kind': 0.63; 'happen': 0.63; 'july': 0.63; 'more': 0.64; 'complex,': 0.84; 'disappear': 0.84; 'float,': 0.84; 'imran': 0.84; 'object:': 0.84; 'otten': 0.84; 'peter,': 0.84; 'pickled': 0.84; '2013': 0.98 X-Injected-Via-Gmane: http://gmane.org/ To: python-list@python.org From: Peter Otten <__peter__@web.de> Subject: Re: UnpicklingError: NEWOBJ class argument isn't a type object Date: Tue, 09 Jul 2013 09:24:41 +0200 Organization: None References: <18dd6d34-5afa-4324-bd2f-f5561413b156@googlegroups.com> Mime-Version: 1.0 Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 7Bit X-Gmane-NNTP-Posting-Host: p5084acfa.dip0.t-ipconnect.de User-Agent: KNode/4.7.3 X-BeenThere: python-list@python.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: General discussion list for the Python programming language List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Newsgroups: comp.lang.python Message-ID: Lines: 120 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1373354695 news.xs4all.nl 15999 [2001:888:2000:d::a6]:54224 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:50219 skunkwerk wrote: > On Monday, July 8, 2013 12:45:55 AM UTC-7, Peter Otten wrote: >> skunkwerk wrote: >> >> >> >> > Hi, >> >> > I'm using a custom pickler that replaces any un-pickleable objects >> > (such >> >> > as sockets or files) with a string representation of them, based on >> > the >> >> > code from Shane Hathaway here: >> >> > http://stackoverflow.com/questions/4080688/python-pickling-a-dict-with- >> >> some-unpicklable-items >> >> > >> >> > It works most of the time, but when I try to unpickle a Django >> >> > HttpResponse, I get the following error: UnpicklingError: NEWOBJ class >> >> > argument isn't a type object >> >> > >> >> > I have no clue what the error actually means. If it pickles okay, why >> >> > should it not be able to unpickle? Any ideas? >> >> >> >> A simple way to provoke the error is to rebind the name referring to the >> >> class of the pickled object: >> >> >> >> >>> import cPickle >> >> >>> class A(object): pass >> >> ... >> >> >>> p = cPickle.dumps(A(), -1) >> >> >>> cPickle.loads(p) >> >> <__main__.A object at 0x7fce7bb58c50> >> >> >>> A = 42 >> >> >>> cPickle.loads(p) >> >> Traceback (most recent call last): >> >> File "", line 1, in >> >> cPickle.UnpicklingError: NEWOBJ class argument isn't a type object >> >> >> >> You may be doing something to that effect. > > Hey Peter, > I tried unpickling even from another file with no other code in it, but > came up with the same error - so I don't think it's a rebinding issue. > > But I got the error to disappear when I removed the "hasattr(obj, > '__getstate__')" from this line of code in the persistent_id function: if > not hasattr(obj, '__getstate__') and isinstance(obj,(basestring, bool, > int, long, float, complex, tuple, list, set, dict)): > return ["filtered:%s" % type(obj)] > > When I do that, I get a few more FilteredObjects in the result, for things > like: > > > I figured these classes must have __getstate__ methods which leads to them > being pickled without a persistent_id (it turns out they actually have > __repr__ methods). > > So these classes get pickled fine, but run into problems when trying to > unpickle them. I understand why ImportErrors would happen if the > necessary modules haven't been loaded, but this NEWOBJ error is still kind > of mystifying. I guess I just won't pickle any classes for now, if > unpickling them is going to be dicey. > > thanks for the help guys, > imran Maybe you can find the problem by temporarily switching from cPickle to the pickle module which produces a slightly more helpful traceback: >>> import cPickle, pickle >>> class A(object): pass ... >>> p = cPickle.dumps(A(), -1) >>> A = 42 >>> cPickle.loads(p) Traceback (most recent call last): File "", line 1, in cPickle.UnpicklingError: NEWOBJ class argument isn't a type object >>> pickle.loads(p) Traceback (most recent call last): File "", line 1, in File "/usr/lib/python2.7/pickle.py", line 1382, in loads return Unpickler(file).load() File "/usr/lib/python2.7/pickle.py", line 858, in load dispatch[key](self) File "/usr/lib/python2.7/pickle.py", line 1083, in load_newobj obj = cls.__new__(cls, *args) TypeError: int.__new__(X): X is not a type object (int)