RESOLVED (was: Re: [albatross-users] Python 2.4.1 incompatibility with al-for ? )

Fri Apr 22 08:25:09 EST 2005

This issue appears to be resolved.

We were supposed to be using the 2.4.1 Python binary. However, it appears 
that inadvertently the 2.4.0 binary was installed.

Replacing 2.4.0 with 2.4.1 seems to have resolved the issue. I can only 
surmise it was a bug in Python 2.4.0.

-- 
Sheila King
sheila at thinkspot.net
http://www.thinkspot.net/sheila/

--On Tuesday, April 19, 2005 11:23 PM -0700 Sheila King 
<sheila at thinkspot.net> wrote:

> OK, I am really at my wits end now.
>
> I've broken this down to an extremely simple template...here is the
> entire file:
>
> -------
> <html><head><title>Test</title></head>
> <body>
> Text
> <al-for iter="entry" expr="_loglist" pagesize="50" prepare/>
>
> </body>
> </html>
> -------
>
> My _loglist is as follows:
>
>>>> ctx.locals._loglist
> ['2005-04-19: Technical Email Address updated<br /><b>From</b>: <br
> /><b>To:</b> root at kserver.org']
>
> It is actually a list with a single string in it (for testing purposes
> this is what I am using, but in actual live use there would probably be a
> list of several strings).
>
> The suggestion to investigate what the MySQLdb module was returning
> (perhaps a different type of object), which sounded like a good lead to
> check, actually turns out to be a non-issue. Both MySQLdb return the
> exact same results and types and objects (all tested from command line).
>
> And as noted previously, the extremely simple template shown above runs
> without error under Python 2.2.2 but under 2.4.1 it repeatedly causes an
> error which is (as far as I can see) failure to produce any output from
> the CGI process, resulting in "premature end of script headers" as the
> logged error message from the web server.
>
> I also ran the same template from the command line, and from command line
> it works just fine under both Pythons. ARRRGH.
>
> Mind you, I'm using SimpleContext when running it from command line. In
> my CGI app I use the Session File context. But when I tried to run that
> from the command line, it had too many missing environment variables and
> I got frustrated with trying to make that work and switched to
> SimpleContext.
>
> I am so lost as to where to go or what to try next. :/
>
> --
> Sheila King
> sheila at thinkspot.net
> http://www.thinkspot.net/sheila/
>
>
> --On Tuesday, April 19, 2005 6:59 AM -0700 Sheila King
> <sheila at thinkspot.net> wrote:
>
>> Hello Andrew,
>>
>> Thanks for the suggestions...
>>
>> --On Tuesday, April 19, 2005 8:25 PM +1000 Andrew McNamara
>> <andrewm at object-craft.com.au> wrote:
>>
>>>> Maybe the mysql library was upgraded when you went
>>>> from 2.2 to 2.4?
>>
>> This is probably true. I will check with the package maintainer for our
>> server to be sure...
>>
>>>> My guess would be that it's returning an iterable,
>>>> rather than an array.
>>
>> I will check it out. What's strange is that I use <al-for> tags on a
>> number of pages in the app, but most of them work fine.
>>
>> I've found another page that is throwing an error although it doesn't go
>> to 500 Internal Server error...probably because I'm catching the error on
>> that page. I will have to investigate what the difference is between the
>> pages where al-for works and where it doesn't, and it does sound like
>> starting with the objects MySQL is returning is the next logical place to
>> look. I believe on the pages where it works, I am constructing my own
>> lists and not directly using the object returned by MySQLdb.
>>
>> Thank you again for the pointer on where to look next...
>>
>> --
>> Sheila King
>> sheila at thinkspot.net
>> http://www.thinkspot.net/sheila/
>>
>>
>>>> Currently <al-for> requires an indexable object
>>>> such as an array or tuple. I guess you could try something like:
>>>
>>> It might also be worth trying to cast the object returned by mysql to a
>>> list explicitly:
>>>
>>>     if result:
>>>         ctx.locals._loglist = list(c.fetchone()['changelog'])
>>>
>>> --
>>> Andrew McNamara, Senior Developer, Object Craft
>>> http://www.object-craft.com.au/
>>>
>>
>>
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>> Albatross-users at object-craft.com.au
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>>
>
>
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