from pyramid.config import Configurator
from pyramid.response import Response
from wsgiref.simple_server import make_server
import json

todos = []

def list_todos(request):
    return Response(json.dumps(todos), content_type='application/json')

def add_todo(request):
    data = request.json_body
    todos.append(data)
    return Response(json.dumps(data), content_type='application/json', status=201)

if __name__ == '__main__':
    with Configurator() as config:
        config.add_route('list_todos', '/todos')
        config.add_view(list_todos, route_name='list_todos', request_method='GET')
        config.add_route('add_todo', '/todos')
        config.add_view(add_todo, route_name='add_todo', request_method='POST')
        app = config.make_wsgi_app()
    server = make_server('0.0.0.0', 6543, app)
    server.serve_forever()

Demonstrates a simple Pyramid application with routes for managing Todo items via REST API.