[mod_python] Module importing with mod_vampire

Graham Dumpleton grahamd at dscpl.com.au
Wed Jul 12 07:23:35 EDT 2006

Whoops, didn't see you had VampireImportHooks set to On. I better think
some more about what you are doing and refresh myself how that feature


On 12/07/2006, at 9:14 PM, Graham Dumpleton wrote:

> On 12/07/2006, at 6:47 PM, apocalypznow wrote:
>> Module importing with mod_vampire is not working.  I get one of  
>> several old copies of the python program I am importing!
>> Here is the relevant section of my httpd.conf file:
>> Alias /forums "/var/www/mod_python/forums"
>> <Directory /var/www/mod_python/forums>
>>   SetHandler python-program
>>   PythonHandler vampire
>>   PythonDebug On
>>   Options -MultiViews -Indexes
>>   PythonPath "['/var/www/mod_python/lib','/var/www/mod_python/ 
>> forums']+sys.path"
>>   PythonOption VampireImportHooks On
>> </Directory>
>> The python program in question "ticket.py" is in the /var/www/ 
>> mod_python/lib folder.  I have also moved it to the /var/www/ 
>> mod_python/forums folder.  The results are the same no matter  
>> where it is.  The calling program is in the /var/www/mod_python/ 
>> forums folder, and it does this:
>> import ticket
>> d = ticket.getData()
> This is nothing to do with Vampire, it is how builtin Python  
> "import" behaves
> in mod_python. Specifically, when you use "import" the module first  
> loaded
> is the one that will be used thereafter. The reason you are seeing  
> several
> old copies is most likely because you are using a version of Apache  
> running
> with the prefork MPM and each request is being served by a  
> different Apache
> child process and which has at different times loaded different  
> versions of
> the module.
> If the module the "import" is being done in is the top level  
> handler module
> loaded by Vampire, instead of using "import" use:
>   ticket = vampire.importModule("ticket")
> Vampire's module importer does not look in sys.path though, so if  
> the "ticket"
> module is not in the same directory, you need to specify the path  
> to get the
> module from.
>   ticket = vampire.importModule("ticket", path=["/some/directory"])
> Directories which modules are imported from using Vampire module  
> loader should
> not also be in sys.path as strange things can happen.
> BTW, you should also read:
>   http://www.dscpl.com.au/articles/modpython-003.html
> for general background information on problems with the module  
> importer in
> mod_python.
> Graham
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