Take only notes from ipynb

take_notes_ipynb.py

def isnote(cell):
    try:
        return cell['metadata']['slideshow'][u'slide_type'] == 'notes'
    except KeyError:
        return False

with open('Presentation.ipynb') as json_data:
    data = json.load(json_data)
    data['cells'] = [cell for cell in data['cells'] if isnote(cell)]
    json.dump(data2, open('Presentation-notes.ipynb', 'w'))