Converting from ipython-notebook to .py

Question

I'm trying to download an ipython notebook file as a .py file. It's working fairly well, except the .py file is interspersed with "In: []" at cell boundaries. I could live with them being there, but I'd rather they weren't.
Any simple fix?

Example output (what I see in the .py file):

# In[4]:

# Get names of all files
text_files = glob.glob('hw3data/*')
#print text_files


# In[5]:

def file_contents(file_name):
    with open(file_name) as f:
        return f.read()

Edit: Essentially, I'm wondering if it's possible to make notebook itself not output #In[ ]. Is there a commandline option, or a utility, or some kind of %magic?

Edit: Going by https://github.com/ipython/ipython/issues/5780, it looks like the suggested solution is just to use a custom template. From minrk:

It's just a marker that indicates where the cells were. It is by design, but it has no effect on the Python, since it is a comment. If you want to remove them, you can use a custom exporter template that doesn't add these comments.

@GoBrewers14 That's okay for small files, but if I were working on something large, it would be easy to miss some. Besides, computers exist to serve us, not the other way around — Jason_L_Bens
– Jason_L_Bens, Commented May 3, 2014 at 4:42

o-90 · Accepted Answer · 2014-05-03 05:57:01Z

1

try

def rc(in_, out_):

    in_ = open(in_, 'r')
    out_ = open(out_,'w')
    out_.write(in_.readline())

    for line in in_:
        if not line.lstrip().startswith('# In['):
            out_.write(line)

    in_.close()
    out_.close()

rc('~/in_file.py', '~/out_file.py')

edited May 3, 2014 at 5:57

answered May 3, 2014 at 5:39

o-90

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5 Comments

Jason_L_Bens Over a year ago

This ends up deleting all comments as well, I think. I'll edit the question to be a bit more clear about what I'd like to do.

Thane Brimhall Over a year ago

@Phox That'd be easy to remedy. Just change the startswith to '# In['

Jason_L_Bens Over a year ago

It is, yeah, and I'm looking to see if notebook has any hooks I could use to run something like this when it exports to a .py file. I'm wondering, though, if notebook can be configured to not put them in at all. It seems really strange, to me at least, that this is included in the output.

o-90 Over a year ago

u might also try putting all the code in one cell in your notebook and putting %%file name_of_file.py at the top of the cell.

Jason_L_Bens Over a year ago

That's a start in the right direction, but it still requires I modify the notebook before I export it. I have a hack I'll throw in another answer, but I'm starting to think that there isn't really an answer that doesn't involve either running a script manually after every export, or changing the notebook like you said.

Jason_L_Bens · Accepted Answer · 2014-05-03 06:33:26Z

0

As a temporary hack, I found that removing lines seven through nine of the python export template of nbconvert (ipython/IPython/nbconvert/templates/python.tpl in site-packages) stops the input prompt from being output. This still isn't ideal, as I'm modifying site packages.

Affected lines:

{% block in_prompt %}
# In[{{ cell.prompt_number if cell.prompt_number else ' ' }}]:
{% endblock in_prompt %}

answered May 3, 2014 at 6:33

Jason_L_Bens

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