Run doctest for modules including relative import statements

doctest.sh

# Relative import problem
# FYI: https://stackoverflow.com/questions/4047227/doctest-and-relative-imports
# 
find tests -name '*.py' | \
# Filtering
grep -v -e 'init.py' -e 'config' | \ 
# This step may be only valid for regular package.
# https://www.python.org/dev/peps/pep-0420/
sed -e 's|.py||g' -e 's|/|.|g' | \ # This 
xargs -L 1 -I {} python -c 'import {}, doctest; doctest.testmod({}, verbose=True)'