下面是一种不使用ipython就可以从V3或V4 ipynb中提取代码的快速而简单的方法。它不检查单元格类型等。

import sys,json

f = open(sys.argv[1], 'r') #input.ipynb
j = json.load(f)
of = open(sys.argv[2], 'w') #output.py
if j["nbformat"] >=4:
        for i,cell in enumerate(j["cells"]):
                of.write("#cell "+str(i)+"\n")
                for line in cell["source"]:
                        of.write(line)
                of.write('\n\n')
else:
        for i,cell in enumerate(j["worksheets"][0]["cells"]):
                of.write("#cell "+str(i)+"\n")
                for line in cell["input"]:
                        of.write(line)
                of.write('\n\n')

of.close()

用于转换所有*。Ipynb将当前目录下的文件递归格式化为python脚本:

for i in *.ipynb **/*.ipynb; do 
    echo "$i"
    jupyter nbconvert  "$i" "$i"
done

遵循前面的例子，但是使用了新的nbformat lib版本:

import nbformat
from nbconvert import PythonExporter

def convertNotebook(notebookPath, modulePath):

  with open(notebookPath) as fh:
    nb = nbformat.reads(fh.read(), nbformat.NO_CONVERT)

  exporter = PythonExporter()
  source, meta = exporter.from_notebook_node(nb)

  with open(modulePath, 'w+') as fh:
    fh.writelines(source.encode('utf-8'))

下面是一种不使用ipython就可以从V3或V4 ipynb中提取代码的快速而简单的方法。它不检查单元格类型等。

import sys,json

f = open(sys.argv[1], 'r') #input.ipynb
j = json.load(f)
of = open(sys.argv[2], 'w') #output.py
if j["nbformat"] >=4:
        for i,cell in enumerate(j["cells"]):
                of.write("#cell "+str(i)+"\n")
                for line in cell["source"]:
                        of.write(line)
                of.write('\n\n')
else:
        for i,cell in enumerate(j["worksheets"][0]["cells"]):
                of.write("#cell "+str(i)+"\n")
                for line in cell["input"]:
                        of.write(line)
                of.write('\n\n')

of.close()

您可以从IPython API完成此操作。

from IPython.nbformat import current as nbformat
from IPython.nbconvert import PythonExporter

filepath = 'path/to/my_notebook.ipynb'
export_path = 'path/to/my_notebook.py'

with open(filepath) as fh:
    nb = nbformat.reads_json(fh.read())

exporter = PythonExporter()

# source is a tuple of python source code
# meta contains metadata
source, meta = exporter.from_notebook_node(nb)

with open(export_path, 'w+') as fh:
    fh.writelines(source)

在你的工具链中有Jupytext是很好的。它不仅允许从笔记本到脚本的转换，而且还可以从脚本返回到笔记本。甚至把那本笔记本打印出来。

jupytext --to py notebook.ipynb                 # convert notebook.ipynb to a .py file
jupytext --to notebook notebook.py              # convert notebook.py to an .ipynb file with no outputs
jupytext --to notebook --execute notebook.py    # convert notebook.py to an .ipynb file and run it