Path: csiph.com!usenet.pasdenom.info!weretis.net!feeder1.news.weretis.net!feeder.erje.net!eu.feeder.erje.net!newsfeed.xs4all.nl!newsfeed2.news.xs4all.nl!xs4all!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; 'versions,': 0.05; 'objects,': 0.07; 'python': 0.09; 'bytes,': 0.09; "object's": 0.09; 'of)': 0.09; 'received:80.91': 0.09; 'received:80.91.229': 0.09; 'received:gmane.org': 0.09; 'received:list': 0.09; 'subject:module': 0.09; '2.7': 0.13; '(the': 0.15; 'file,': 0.15; '2.7?': 0.16; 'program?': 0.16; 'received:80.91.229.3': 0.16; 'received:dip.t-dialin.net': 0.16; 'received:plane.gmane.org': 0.16; 'received:t-dialin.net': 0.16; 'later': 0.16; 'string': 0.17; 'wrote:': 0.17; 'module,': 0.17; 'string,': 0.17; 'load': 0.19; 'module': 0.19; 'skip:p 30': 0.20; 'translate': 0.20; 'written': 0.20; 'object.': 0.22; 'somebody': 0.23; 'project,': 0.24; 'header:User-Agent:1': 0.26; 'creating': 0.26; 'header:X -Complaints-To:1': 0.28; 'actual': 0.28; 'embed': 0.29; 'parameters.': 0.29; 'pickle': 0.29; 'piece': 0.29; 'protocols': 0.29; 'yields': 0.29; 'objects': 0.29; 'source': 0.29; 'class': 0.29; "i'm": 0.29; 'maybe': 0.29; 'classes': 0.30; 'knows': 0.30; 'code': 0.31; 'file': 0.32; 'anybody': 0.32; "aren't": 0.33; 'platforms.': 0.33; 'problem': 0.33; 'to:addr:python-list': 0.33; 'version': 0.34; "can't": 0.34; 'project': 0.34; 'so,': 0.35; 'there': 0.35; 'received:org': 0.36; 'but': 0.36; 'loaded': 0.36; 'method': 0.36; "i'll": 0.36; 'possible': 0.37; 'does': 0.37; 'subject:: ': 0.38; 'nothing': 0.38; 'instead': 0.39; 'to:addr:python.org': 0.39; 'short': 0.39; 'application': 0.40; 'header:Received:5': 0.40; 'save': 0.61; 'containing': 0.61; 'solve': 0.62; 'provide': 0.62; 'between': 0.63; 'series': 0.63; 'different': 0.63; 'information': 0.63; 'results': 0.65; '2.7.': 0.84; 'web!': 0.91 X-Injected-Via-Gmane: http://gmane.org/ To: python-list@python.org From: Peter Otten <__peter__@web.de> Subject: Re: pickle module doens't work Date: Thu, 27 Dec 2012 12:29:19 +0100 Organization: None References: Mime-Version: 1.0 Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 7Bit X-Gmane-NNTP-Posting-Host: p5084a838.dip.t-dialin.net 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: 37 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1356607732 news.xs4all.nl 6934 [2001:888:2000:d::a6]:47950 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:35610 Omer Korat wrote: > I'm working on a project in Python 2.7. I have a few large objects, and I > want to save them for later use, so that it will be possible to load them > whole from a file, instead of creating them every time anew. It is > critical that they be transportable between platforms. Problem is, when I > use the 2.7 pickle module, all I get is a file containing a string > representing the commands used to create the object. But there's nothing I > can do with this string, because it only contains information about the > object's module, class and parameters. And that way, they aren't > transportable. In python 3.3 this problem is solved, and the pickle.dump > generates a series of bytes, which can be loaded in any other module > independently of anything. But in my project, I need NLTK 2.0, which is > written in python 2.7... > > Anybody has suggestions? Maybe there is a way to use pickle so that it > yields the results I need? Or is there any other module that does pickle's > job? Or perhaps there is a way to mechanically translate between python > versions, so I'll be able to use pickle from 3.3 inside an application > written in 2.7? Or perhaps somebody knows of a way to embed a piece of 3.3 > code inside a 2.7 program? > > It can't be I'm the only one who wants to save python objects for later > use! There must be a standard method to do this, but I couldn't find any > on the web! If someone can solve this for me I'll be so grateful. Pickling works the same way in Python 2 and Python 3. For classes only the names are dumped, so you need (the same version of) NLTK on the source and the destination platform. If you can provide a short demo of what works in Python 3 but fails in Python 2 we may be able to find the actual problem or misunderstanding. Maybe it is just that different protocols are used by default? I so, try with open(filename, "wb") as f: pickle.dump(f, your_data, protocol=pickle.HIGHEST_PROTOCOL)