Convert an IPython notebook to console-like text output.

ipynb2txt.py

# Conversion from JSON to TXT.
import os
import json

def process_input(cell):
    if 'prompt_number' not in cell:
        return ''
    prefix = "In [{0:s}]: ".format(str(cell['prompt_number']))
    spaces = ' ' * len(prefix)
    contents = prefix + cell['input'][0]
    for line in cell['input'][1:]:
        contents += spaces + line + ''
    return contents

def process_outputs(cell):
    if not cell['outputs']:
        return ''
    prefix = "Out[{0:d}]: ".format(cell['prompt_number'],)
    spaces = ' ' * len(prefix)
    contents = ''
    for output in cell['outputs']:
        if output['output_type'] == 'pyout':
            if len(contents) > 0:
                contents += spaces
            else:
                contents += prefix
        contents += ''.join(output['text']) + ''
    #contents += '\n'
    return contents

def process_cell(cell):
    if cell['cell_type'] == 'code':
        contents = process_input(cell)
        contents += '\n'
        contents += process_outputs(cell)
    elif cell['cell_type'] == 'markdown':
        contents = '' + ''.join(cell['source']) + '\n'
    return contents

def process_cells(cells):
    return '\n'.join(map(process_cell, cells))

def convert(filename):
    filename_to = os.path.splitext(filename)[0] + '.txt'
    with open(filename, 'r') as f:
        contents = json.load(f)
    text = process_cells(contents['worksheets'][0]['cells'])
    with open(filename_to, 'w') as f:
        f.write(text)
        
def main():
    import sys
    files = sys.argv[1:]
    if not files:
        files = filter(lambda f: f.endswith('.ipynb'), os.listdir('.'))
    for file in files:
        convert(file)

if __name__ == '__main__':
    main()