Hello world WSGI Python application

myapp.wsgi

#-*- coding: utf-8 -*-
def application(environ, start_response):
    import sys
    pvar = 'Hello world !!'
    output = pvar.encode('utf8')
    # output = sys.version.encode('utf8')
    status = '200 OK'
    headers = [('Content-type', 'text/plain'),
               ('Content-Length', str(len(output)))]
    start_response(status, headers)
    yield output