On Fri, Apr 16, 2010 at 4:51 PM, Benjamin Peterson <benja...@python.org>wrote:
> 2010/4/16 Daniel Stutzbach <dan...@stutzbachenterprises.com>: > > IIRC, there's a performance hack in dictobject.c that keeps track of > whether > > all of the keys are strings or not. The hack is designed so that lookup > > operations can call the string compare/hash functions directly if > possible, > > rather than going through the slower PyObject_ functions. > > That won't work. You could put non-string keys in a dictionary and > remove them, but the dictionary would still be in the less optimized > state. > It would be enough to make the common case fast (1 pointer comparison). The error case would need to check all of the keys, true, but that's not really a performance concern. Unless you're saying you often create a dictionary, add non-string keys, remove the non-string keys, then pass it as a **kwds? ;-) -- Daniel Stutzbach, Ph.D. President, Stutzbach Enterprises, LLC <http://stutzbachenterprises.com>
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