Hi,
I'm a PHP-programmer who evaluates Python for a new project.
I really like a lot of concepts of Python, especially the shell, but there
is one great feature of PHP which I don't know how to replace in Python:
For database-intensive webpages, I like to cache the HTML-output on the fly
in the filesystem and put out the file later whenever the same URL is
requested again, for example:
/cache/some_url:
<html>
important database result that took 20 minutes to generate
</html>
and:
/www/master_script.p hp:
<?
if (is_file("/cache/$URL")) include("/cache/$URL");
else include("/scripts/soo_long_and_co mplicated.php") ;
?>
So far so good, shouldn't be too much of problem to do something similar in
Python.
However, it's sometimes necessary to still access the database, for example
to rotate banners, show user-specified style-sheets, change output
depending on the used browser, etc.
In PHP it's trivial to do this, instead of caching the output of a function,
I just cache "<? function(); ?>", so the example looks like this:
<html>
<? echo random_banner() ; ?>
important database result that took 20 minutes to generate
</html>
I've used this technique for about a year now and it works great for
semi-static pages (which are manually changed) or some not too fast
changing dynamic pages, in some cases I reduced the database-load to 20%.
The beauty of it is that I can use the same "random_banner_ ()" function for
the cache and on the fly.
As far as I've seen, there is no way to embed Python-code in a webpage with
"<? ?>" or anything equivalent and I don't see any other way to solve this
problem.
But maybe somebody else does, I'd apreceate all ideas,
Thanks a lot
--
"I don't suffer from insanity, I enjoy every minute of it"
- Calvin
Jul 18 '05
11  1767 
Thomas Guettler wrote: Am Fri, 16 Apr 2004 12:38:16 +0200 schrieb Robert Ferber:
Hi,
I'm a PHP-programmer who evaluates Python for a new project.
I really like a lot of concepts of Python, especially the shell, but
there is one great feature of PHP which I don't know how to replace in
Python:
For database-intensive webpages, I like to cache the HTML-output on the
fly in the filesystem and put out the file later whenever the same URL is
requested again, for example:
The problem with caching: When is
the data outdate?
Currently I just use the file creation date. I set it for example 2 weeks
into the future and whenever the creation date is in the past it is
assumend out of date.
You could use this approach:
Run a cron-job every hour which does the complicated
query which needs long to compute. Dump
the result into a file (Look for "pickle"
in the module index of the docs).
That wouldn't work, in fact it would make matters worse.
First of all, I couldn't have different times for caches to get out of date,
then, more importantly, I'd have to run it for every possible combination
at once, for example for script.php?a=1& b=2&c=3, I'd have to do all
combinations for a, b and c which could lead to thousands, sometimes
millions of combinations.
Also, there is no way to know which values of a, b and c are even possible,
so I wouldn't even know what to generate.
--
Harte Arbeit zahlt sich später mal aus. Faulheit sofort!
Ville Vainio wrote: >> "rob" == Robert Ferber <ro*@nospam.net > writes:
rob> Hi, I'm a PHP-programmer who evaluates Python for a new
rob> project. I really like a lot of concepts of Python,
rob> especially the shell, but there is one great feature of PHP
rob> which I don't know how to replace in Python:
rob> <html>
rob> <? echo random_banner() ; ?>
rob> important database result that took 20 minutes to generate
rob> </html>
Check out the new mod_python, it offers exactly the functionality you
need. Some discussion is here:
http://www.onlamp.com/pub/a/python/2...ver_pages.html
This looks very promising, thanks a lot.
--
"Statistics are like bikinis. What they reveal is suggestive,
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