nbreversible
reversible nbconvert. (.ipynb <-> .py)
# convert .ipynb to .py
$ python -m nbreversible foo.ipynb > foo.py
# convert .py to .ipynb
$ python -m nbreversible foo.py > foo.ipynb
# re: convert .ipynb to .py
$ python -m nbreversible foo.ipynb > foo.py