text: from pyramid.config import Configurator
  from sqlalchemy import engine_from_config
  
  from .models import (
      DBSession,
      Base,
      )
  
  
  def main(global_config, **settings):
      """ This function returns a Pyramid WSGI application.
      """
      engine = engine_from_config(settings, 'sqlalchemy.')
      DBSession.configure(bind=engine)
      Base.metadata.bind = engine
      config = Configurator(settings=settings)
      #config.add_static_view('static', 'static', cache_max_age=3600)
      config.add_route('home', '/')
      config.add_route('simple_example', '/simple_example/')
      config.add_route('relation_example', '/relation_example/')
      config.scan()
      return config.make_wsgi_app()
  