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Showing content from https://mail.python.org/pipermail/python-dev/2012-November/122744.html below:

[Python-Dev] performance of {} versus dict(), de fmd(**kw): return kw trumps all ; -)

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martin at v.loewis.de wrote:
> It's faster than calling dict() because the dict code will
> create a second dictionary, and discard the keywords dictionary.

Perhaps in the case where dict() is called with keyword
args only, it could just return the passed-in keyword
dictionary instead of creating another one?

-- 
Greg

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