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Thu Mar 5 22:36:35 CET 2009 · https://mail.python.org/pipermail/python-dev/2009-March/086814.html

Guido van Rossum wrote:

> This was a bad idea (*), and I'd be happy to ban it -- but we'd
> probably have to bump the pickle protocol version in order to maintain
> backwards compatibility.

If you're talking about multiple calls to dump() on the same
pickler, it might be a bad idea for a network connection, but
I don't see anything wrong with using it on a file, and I find
it useful to do so sometimes. Banning it would be excessive, IMO.

> The exposition is unintentional but for historic reasons we can't just
> remove it. :-(

A compromise might be to provide a memo attribute that returns
a wrapper around the underlying cache -- maybe with only a
clear() method if that's all you want to support.

-- 
Greg

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[Python-Dev] Pickler/Unpickler API clarification