ipython_notebook_config.txt

#Check the location on your IPython notebook profile:
#    ipython locate profile default
#
#If you do not have any, create a new one:
#    ipython profile create
#
#In your profile directory, you can find a file named ipython_notebook_config.py.
#You can add extra functionalities to your IPython notebook there.
#
#We add the functionality of creating a .py file next to the .ipynb file each time
#the notebook is saved. This is also called a post-hook method.
#We based our solution on this snippet, which also converts the notebook to a
#Python script file but with less metadata.
#
# Auto-convert ipython notebooks to a readable and version-controllable python script file
# This was useful: https://gist.github.com/masnick/d89c03ba3f0ad48416a5
#
################################################################################

#===============================================================================
#This script is released under the MIT License
#
#Copyright (c) 2015 Balabit SA
#
#Permission is hereby granted, free of charge, to any person obtaining a copy of
#this software and associated documentation files (the "Software"), to deal in
#the Software without restriction, including without limitation the rights to use,
#copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
#Software, and to permit persons to whom the Software is furnished to do so,
#subject to the following conditions:
#
#The above copyright notice and this permission notice shall be included in all
#copies or substantial portions of the Software.
#
#THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
#INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
#PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
#HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
#ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
#WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#===============================================================================
#
#In ipython_notebook_config.py, we insert the following Python code:

import sys
import json
import os

reload(sys)
sys.setdefaultencoding('utf8')

def get_notebook_data(path_to_file):
    with open(path_to_file, 'r') as notebook:
        notebook_data = json.load(notebook)
    return notebook_data

def construct_output_py_file_path(input_file_path, skip_if_exists=True):
    input_headless, ext = os.path.splitext(input_file_path)
    assert ext=='.ipynb'
    output_by_path = input_headless + '.py'
    if os.path.exists(output_by_path) and skip_if_exists:
        return
    return output_by_path

def write_notebook_data_to_py(notebook_data, out_file_path):
    with open(out_file_path, 'w') as output:
        output.write('# -*- coding: utf-8 -*-\n')
        output.write('# <nbformat>' + str(notebook_data['nbformat']) + '</nbformat>\n')
        try:
            cells = notebook_data['cells']
        except KeyError:
            print "Nbformat is " + str(notebook_data['nbformat']) + ", try the old converter script."
            return

        for cell in cells:
            if cell['cell_type'] in ['code', 'markdown']:
                output.write('\n')
                output.write('# <' + cell['cell_type'] + 'cell' + '>\n')
                output.write('\n')
                for item in cell['source']:
                    if cell['cell_type']=='code':
                        output.write(item)
                    else:
                        output.write('# ')
                        output.write(item)
                output.write('\n')

def post_save(model, os_path, contents_manager):
    """post-save hook for converting notebooks to .py scripts"""
    if model['type'] != 'notebook':
        return # only do this for notebooks
    if 'Untitled' in os_path:
        return # do not save untitled notebooks

    output_file_path = construct_output_py_file_path(os_path, skip_if_exists=False)
    notebook_data = get_notebook_data(os_path)
    write_notebook_data_to_py(notebook_data, output_file_path)
    print output_file_path, "was successfully saved"

c = get_config()
c.FileContentsManager.post_save_hook = post_save