"Sticking a php file in a directory" is just a matter of server config, not languages. There is no reason why you can't put a quick Python web app in a single file which exposes just one WSGI application object named 'application' - so if the server complied, you could indeed just stick the .py file in a certain magical directory.
It's been done times and times again. Look at Sinatra for an example in the ruby world (http://www.sinatrarb.com/), I'm sure python has something similar. Maybe a static site generator such as octopress or push would be an option as well.
The problem is that the simple php approach does not scale. Sticking files in directories will only get you a small step, you'll need includes to share code soon. And then the mess starts if you're not using a framework. And good PHP frameworks go a long way beyond sticking a file in a directory - you'll have the same steep learning curve as with rails or something similar.
>They all require way too much. Php just works for my needs.
What? I understand for a beginner, but come on. If you're really a programmer programming for many hours aday... you really won't take the time to learn how to wire up wsgi to a python process? It's no harder than wiring Apache up to mod_php5 and telling it where to serve out of. It just takes a very modest effort on your part to learn it.
And then you get all the benefits of... not having to use PHP and getting to use... anything else.
