from wsgiref.simple_server import make_server
 
def run_server(environ, start_response):
  start_response('200 OK', [('Content-Type', 'text/html')])
  return [bytes('<h1>Hello, web!</h1>', encoding='utf-8'), ] #字节
 
 
if __name__ == '__main__':
  httpd = make_server('127.0.0.1', 8000, run_server)
  httpd.serve_forever()

from werkzeug.wrappers import Response
from werkzeug.serving import run_simple
 
def run_server(environ, start_response):
  response = Response('hello')
  return response(environ, start_response)   #对象
 
if __name__ == '__main__':
  run_simple('127.0.0.1', 8000, run_server)