ステムがPythonで新しいIPアドレスを生成しない

Question

Signal.NEWNYMが新しいIPアドレスを生成しないのはなぜですか？

from stem import Signal 
from stem.control import Controller 
import requests 

with Controller.from_port(port=9051) as controller: 
    print('Ready') 
    controller.authenticate(password='872860B76453A77D60CA2BB8C1A7042072093276A3D701AD684053EC4C') 
    print("Success!") 
    controller.signal(Signal.NEWNYM) 
    print("New Tor connection processed") 
    print(requests.get('http://icanhazip.com').content)