web.py is probably the simplest web framework out there. "Bare" CGI is simpler, but you're completely on your own when it comes to making a service that actually does something.
"Hello, World!" according to web.py isn't much longer than an bare CGI version, but it adds URL mapping, HTTP command distinction, and query parameter parsing for free:
import web urls = ( '/(.*)', 'hello' )
app = web.application(urls, globals())
def GET(self, name):
if not name: name = 'world'
return 'Hello, ' + name + '!'
if __name__ == "__main__":