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.include('pyramid_chameleon')
    config.add_static_view('static','static',cache_max_age=3600)
    config.add_route('home','/')
    config.scan()
    return config.make_wsgi_app()

我在配置器参数中丢失了settings = settings.

这个告诉python是什么？