using python in web applications

[Laurent]

Well PyPy is just an implementation of Python among many others (but limited to version 2.7). It is not a web server. If you want to make PyPy interact with a web server (such as nginx) you have to use a special protocol such as WSGI or Fast-CGI. For best performances you can for instance use uWSGI that integrates well with nginx but for this you have to recompile nginx. As you see it's a bit complex, you should read the wikis. May the Force be with you.