Where should I store libraries in a good Django project structure?

In one of the apps of my Django site I require a third-party module/library. I've been reading up on how a good Django project should be structured but it doesn't mention much about storing libraries. My current project is structured like so:

urls.py
manage.py
settings.py
apps
    app1
        views.py
        models.py
        manager.py
        tests.py
    app2
        ...
        ...
        ...
        ...

Should a create a directory at the top-level named libs and dump it there or should I create a libs directory under the specific app folder that I'll be using this in?

Another thing was that when I code Django, I try and keep my views, models and managers very light. If some complex stuff is needed, I create a class/module and dump stuff there. Should I put this in the specific app folder that I'll be using this in or should this go to libs folder as well? I often have a helpers.py file in my apps but I use that for generally storing quite s开发者_JS百科mall and simple helper functions.

One could obviously put the library anywhere. It's all the same to Python but not necessarily the right way to go about this.

Thanks.

---

If this is a third-party library, it shouldn't be kept in your source code at all.

If you use virtualenv, you get a complete environment that you can install libraries in specifically for that project. Plus, in conjunction with pip, you can set up a requirements.txt file which specifies all the libraries you need to run the project, and installs them in one go when you start on a new machine, or deploy to production.