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Showing content from http://mail.python.org/pipermail/python-dev/2002-August/028444.html below:

[Python-Dev] Rehashing in PyDict_Copy

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Is there a reason that dict.copy() runs like an update()?
It creates a new dict object, then re-hashes and inserts
every element one-by-one, complete with collisions.

I would have expected a single pass to update refcounts,
an allocation for identical size, and a memcpy to polish
it off.

Raymond

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