Author inada.naoki
Recipients inada.naoki, jdemeyer, larry, python-dev, rhettinger, vstinner
Date 2019-07-09.02:46:31
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Message-id <1562640392.03.0.102624176701.issue29312@roundup.psfhosted.org>
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Content
> Changing dict.update() calling convention may save a few nanoseconds on d1.update(d2) call, but it will make d1.update(**d2) way slower with a complexity of O(n): d2 must be converted to 2 lists (kwnames and args) and then a new dict should be created.

But who/why use d1.update(**d2)?
In case of dict(), dict(d1, **d2) was idiom to merge two dicts.
But I don't know any practical usage of d1.update(**d2).  d1.update(d2) should be preferred.
History
Date User Action Args
2019-07-09 02:46:32inada.naokisetrecipients: + inada.naoki, rhettinger, vstinner, larry, python-dev, jdemeyer
2019-07-09 02:46:32inada.naokisetmessageid: <1562640392.03.0.102624176701.issue29312@roundup.psfhosted.org>
2019-07-09 02:46:32inada.naokilinkissue29312 messages
2019-07-09 02:46:31inada.naokicreate