ImportError: No module named 'shell' when importing twill

Question

i was trying to import from twill module but this error happens to me what should i do ?

from twill.commands import *
go("http://www.python.org/")

this is the error :

  File "d:\Users\Erfan\Anaconda3\lib\site-packages\twill-0.9-py3.5.egg\twill\__init__.py", line 52, in <module>
    from shell import TwillCommandLoop

ImportError: No module named 'shell'