[pypy-issue] [issue1022] dict.update significantly slower than series of dict.__setitem__
Armin Rigo
tracker at bugs.pypy.org
Sat Feb 18 12:19:07 CET 2012
Armin Rigo <armin.rigo at gmail.com> added the comment:
It probably doesn't help: the issue seems to be the slowness of "**kwds"
argument passing. If you're thinking about app-level, then it's code like that:
def update(d, **kwds):
for key, value in kwds.items(): # or iteritems()
d[key] = value
But that would be much slower than a series of direct setitems, and most
probably also slower than the RPython equivalent that we have now.
To fix this we need to think about how to improve __args__.parse_obj() in a way
that lets it enumerate the keywords without actually building a w_kwds dictionary.
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nosy: +arigo
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