Test notebooks for compliance

Author: ocefpaf

.travis.yml

@@ -50,6 +50,7 @@ script:
 
     - if [[ $TEST_TARGET == 'coding_standards' ]]; then
         find . -type f -name "*.py" ! -name 'conf.py' | xargs flake8 --max-line-length=100 ;
+        for file in $(find . -type f -name "*.ipynb"); do jupyter nbconvert --template=tests/strip_markdown.tpl --stdout --to python $file | grep -v '^get_ipython' | flake8 - --ignore=W391,E226,E402 --max-line-length=100 --show-source ; done ;
       fi
 
     - if [[ $TEST_TARGET == 'notebooks' ]]; then

tests/strip_markdown.tpl

@@ -0,0 +1,9 @@
+# Remove markdown cells.
+{% extends 'python.tpl'%}
+{% block markdowncell -%}
+{% endblock markdowncell %}
+
+# Change the appearance of execution count.
+{% block in_prompt %}
+# This was input cell with execution count: {{ cell.execution_count if cell.execution_count else ' ' }}
+{%- endblock in_prompt %}