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Showing content from https://mail.python.org/pipermail/python-dev/2007-June/073615.html below:

[Python-Dev] Instance variable access and descriptors

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Phillip J. Eby wrote:
> ...at the cost of slowing down access to properties and __slots__, by 
> adding an *extra* dictionary lookup there.

Rather than spend time tinkering with the lookup order,
it might be more productive to look into implementing
a cache for attribute lookups. That would help with
method lookups as well, which are probably more
frequent than instance var accesses.

--
Greg

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