#26095: Same behaviour of dict.items and defaultdict.items in DTL
-------------------------------------+-------------------------------------
Reporter: kbr | Owner: kbr
Type: | Status: assigned
Cleanup/optimization |
Component: Template system | Version: master
Severity: Normal | Resolution:
Keywords: templates dict | Triage Stage:
defaultdict | Unreviewed
Has patch: 1 | Needs documentation: 1
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Comment (by kbr):
Well, the isinstance()-call is about 4 times slower than the direct access
(d[bit] alone takes about 98 ns. (on a dict with a single entry)).
{{{
%%timeit
if isinstance(d, defaultdict):
pass
res = d[bit]
1000000 loops, best of 3: 378 ns per loop
}}}
Whether this is a real bottleneck depends how often Variable.resolve gets
called and - may be more important - other time consuming parts of the
application. Will try djangobench the next days. Thank you for the review
so far.
--
Ticket URL: <https://code.djangoproject.com/ticket/26095#comment:6>
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