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To: python-list@python.org
From: "Gabriel Genellina" <gagsl-py2@yahoo.com.ar>
Subject: Re: cPickle -> invalid signature
Date: Tue, 17 May 2011 09:29:01 -0300
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Xref: x330-a1.tempe.blueboxinc.net comp.lang.python:5561

En Tue, 17 May 2011 08:41:41 -0300, Neal Becker <ndbecker2@gmail.com>  
escribió:

> What does it mean when cPickle.load says:
> RuntimeError: invalid signature
>
> Is binary format not portable?

Are you sure that's the actual error message?
I cannot find such message anywhere in the sources.
The pickle format is quite portable, even cross-version. As a generic  
answer, make sure you open the file in binary mode, both when writing and  
reading.

-- 
Gabriel Genellina