Nick Coghlan added the comment:

Perhaps the hash could just be based on a subset of the items? For example, 
hash the format, shape and the first and last items?

Yes, such an approach means you're more likely to get collisions if you do 
start hashing these, but that seems better than making hashing itself 
excessively slow.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue15573>
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