How to fix error in python /flask AttributeError has no attribute?

I

idin2017-01-13 14:27:36

Open ID

idin, 2017-01-13 14:27:36

I deal with Flask according to the manual on Habré https://habrahabr.ru/post/222983/ , and in general on chapter 5 after:

from flask.ext.openid import OpenID

an error occurs:

_IterParseIterator = pure_pymod._IterParseIterator
AttributeError: module 'xml.etree.ElementTree' has no attribute '_IterParseIterator'

did I understand correctly that this is due to the fact that the one hundred module simply does not fit Python3.6 or I just didn’t install something)) thanks in advance))