On Fri, Apr 16, 2010 at 4:11 PM, Raymond Hettinger < [email protected]> 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. I don't know if the the current validating of **kwds with Python functions already leverages that hack or not. -- Daniel Stutzbach, Ph.D. President, Stutzbach Enterprises, LLC <http://stutzbachenterprises.com>
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