[Python-Dev] [Python-checkins] cpython: Issue #14687: str%tuple now uses an optimistic "unicode writer" instead of an

[Victor Stinner]

>> http://hg.python.org/cpython/rev/f1db931b93d3
>> changeset:   76730:f1db931b93d3
>> user:        Victor Stinner<victor.stinner at gmail.com>
>> date:        Thu May 03 13:10:40 2012 +0200
>> summary:
>>   Issue #14687: str%tuple now uses an optimistic "unicode writer" instead
>> of an
>> accumulator. Directly write characters into the output (don't use a
>> temporary
>> list): resize and widen the string on demand.
>
> I am curious whether these optimizations for str % tuple get applied to
> equivalent str.format(*tuple) calls or if you plan to make them do so. It
> seems to me that there could be one internal function that does the
> concatenation, with lengthening and resizing, of literal and formatted
> substrings, for both interfaces.

I just wrote a patch for str.format().
http://bugs.python.org/issue14716

The speed up is between 0% and 27%.

Victor