Hello, There's been a bug open where doctest can break if there are proxy objects that fail to unwrap (https://bugs.python.org/issue35753) since python 3.7, this includes when importing 'call' from the 'mock' module. Does someone have time to review PR 22981 (https://github.com/python/cpython/pull/22981). Last feedback from folks with merge capabilities seems to be from November 8th.  I've replied a few times in December on the PR but there is no response. -Alfred