[Python-ideas] Re: Explicitly defining a string buffer object (aka StringIO += operator)

March 30, 2020


      On Tue, Mar 31, 2020 at 03:01:51PM +1100, Steven D'Aprano wrote:
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nor the fastest way
It's pretty close though.
On my test, accumulating 500,000 strings into a list versus a StringIO 
buffer, then building a string, took 27.5 versus 31.6 ms. Using a string 
took 36.4 ms. So it's faster than the optimized string concat, and 
within arm's reach of list+join.
I re-ran the test with a single non-ASCII character added to the very 
end, '\U0001D400'. Both the list and the StringIO versions slowed down 
by about the same amount of time (approx 4ms) so the difference between 
them remained the same in absolute terms but shrank marginally in 
relative terms. YMMV.


-- 
Steven