2010/4/16 Daniel Stutzbach <dan...@stutzbachenterprises.com>: > On Fri, Apr 16, 2010 at 4:11 PM, Raymond Hettinger > <raymond.hettin...@gmail.com> wrote: >> >> ISTM that making it illegal costs cycles with giving any real benefit. >> It is reasonably common to accept **kwds and then pass it down >> to another function. Do we want to validate the keys of every >> kwds dict on every call? Why do we even care? > > 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. > > Consequently, validating **kwds should be cheap.
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. -- Regards, Benjamin _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
