Multiple python web applications running on multiple domains (virtualhost)?
Apache/mod_wsgi can do what is required. Each mounted web application under mod_wsgi will run in a distinct sub interpreter in the same process so can be using different code bases. Better still, you use daemon mode of mod_wsgi and delegate each web application to distinct process so not risk of them interfering with each other.
I am stuck and desperate. 
Is it possible to serve multiple python web applications on multiple different domains using virtualhost on cherrypy? Hmm wait... I will answer myself: Yes, it is possible. With virtual host dispatcher it is possible, until i require this:
I need to use more instances of same application but in different versions. This means that I need to somehow split the namespace for the python import for these applications. 
Example:
I have application MyApp and there are two versions of it. I have got two domains app1.com and app2.com. 
When I access app1.com I would like to get the application MyApp in version 1. When I access app2.com, it should be MyApp in version 2.
I am now using the VirtualHostDispatcher of cherrypy 3.2 and the problem is that, when I use import from the methods of MyApp version 1 and the MyApp version 2 has been loaded before, python will use the already imported module (because of module cache).
Yes.. it is possible to wrap the import and clean the python module cache everytime (i use this for the top level application object instantiation), but it seems quite unclean for me... And I think that it is also inefficient...
So, what do you recommend me? 
I was thinking about using apache2 and cherrypy using Mod_WSGI, but it seems that this does not solve the import problem, becuase there is still one python process for all apps togetger.
Maybe, I am thinking about the whole problem completely wrong and I will need to re-think it. I am opened for every idea or tip. Only limitation is that i want to use Python 3. Anything else is still opened for discussion :-)
Thank you for every response!