import http.server

class EigenerHandler(http.server.BaseHTTPRequestHandler):

    def do_GET(self):
        self.send_response(200)
        self.end_headers()
        if(self.path == "/Yang.htlm"):
            with open("Yang.html", "r") as f:
                msg = f.read()
        else:
            with open("Ying.html", "r") as f:
                msg = f.read()
        self.wfile.write(msg.encode('utf-8'))

port = 12345
handler = EigenerHandler
address = ('', port)

server = http.server.HTTPServer(address, handler)
server.serve_forever()