[Python-Dev] peps: PEP 456: add some of the new implementation details to the PEP's text

Terry Reedy tjreedy at udel.edu
Thu Nov 14 23:46:05 CET 2013

On 11/14/2013 4:00 AM, Antoine Pitrou wrote:
> On Wed, 13 Nov 2013 23:33:02 +0100 (CET)
> christian.heimes <python-checkins at python.org> wrote:
>> +Small string optimization
>> +=========================
>> +
>> +Hash functions like SipHash24 have a costly initialization and finalization
>> +code that can dominate speed of the algorithm for very short strings. On the
>> +other hand Python calculates the hash value of short strings quite often. A
>> +simple and fast function for especially for hashing of small strings can make

'for especially for hashing' is garbled. Delete first 'for'.

>> +a measurably impact on performance. For example these measurements were taken


>> +during a run of Python's regression tests. Additional measurements of other
>> +code have shown a similar distribution.

Terry Jan Reedy

More information about the Python-Dev mailing list