From: aahz at netcom.com (Aahz Maruch)
Date: Sat, 3 Apr 1999 00:01:31 GMT
Subject: string.join() vs % and + operators
References: <37054490.E79ADCC9@easystreet.com>
Message-ID: <aahzF9L6qJ.1Jw@netcom.com>
Content-Length: 1175
X-UID: 396                                                  

In article <37054490.E79ADCC9 at easystreet.com>,
Al Christians  <achrist at easystreet.com> wrote:
>
>This ran amazingly fast on my Pentium 200 Mhz -- around 11 seconds for
>Way 1, and 7 for Way 2.  So, either way, Python can put together about
>1 million little strings in a second.  Way 3, the way that one would 
>expect to be bad, recreating the string with each concatenation, was
>much slower, but only took about 1 minute.  Surprisingly swift as well.
>
>Anybody have anything to add to this?  Are there any related pitfalls
>that I may have missed?

Yup.  Using '+' for strings really bites when you've got long (or
potentially long) strings.  The average size of the string you're
concatenating is about a hundred characters; suppose you're doing CGI
work with redirects, and you're looking at closer to three hundred
characters a pop.

Try adding a 1K pre-string to the front of each of your Ways and see
what happens to the speed.
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