STINNER Victor added the comment:
> If you see a factor of 30x difference in your code, I suspect it's not
> related to str.format(), but some other processing in your code.
The performance of instructions like ("x=%s" % x) or ("x={}".format(x)) depend
on the length of the string. Maybe poostenr has some very long strings?
--
Closed issues related to _PyUnicodeWriter API:
* issue #14716: Use unicode_writer API for str.format()
* issue #14687: Optimize str%tuple for the PEP 393
* issue #14744: Use _PyUnicodeWriter API in str.format() internals
* issue #16147: Rewrite PyUnicode_FromFormatV() to use the _PyUnicodeWriter API
* issue #17694: Enhance _PyUnicodeWriter API to control minimum buffer length
without overallocation
* issue #19513: Use PyUnicodeWriter instead of PyAccu in repr(tuple) and
repr(list)
* issue #19646: Use PyUnicodeWriter in repr(dict)
I'm listing these issues because they contain microbenchmarks script if you
would like to play with them.
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue26118>
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