https://www.piwheels.org/project/pytest-doctest-import/
piwheels - pytest-doctest-import
The piwheels project page for pytest-doctest-import: A simple pytest plugin to import names and add them to the doctest namespace.
piwheelspytestdoctestimport
https://blog.ocharles.org.uk/blog/posts/2013-12-18-doctest.html
24 Days of Hackage: doctest
dayshackagedoctest