Antoine Pitrou <pit...@free.fr> added the comment:

> However, this only seems to be true if the pickle file is created
> using pickle - it doesn't happen with files generated with cPickle.
> With cPickle the dict remains tracked, and passes from generation 0 to
> 1 to 2. The only difference is that pickle memoizes the tuples, while
> cPickle doesn't. Why does the memoization make a difference?

Probably because memoization itself uses a dict.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue14775>
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