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Re: Can you automatically noweb include?

From: Thomas S. Dye
Subject: Re: Can you automatically noweb include?
Date: Fri, 07 Aug 2020 11:18:57 -1000
User-agent: mu4e 1.2.0; emacs 26.3

It works here if you remove the blank line between the headline and the PROPERTIES block.

William McCoy writes:


Thanks very much for your response. I didn't know about those options. When I
use C-c C-v C-i, I get the following:

Lang: python
    :header-args    nil
    :header-args:python     nil
Header Arguments:
    :cache          no
    :exports        code
    :hlines         no
    :noweb          no
    :results        output replace
    :session        none
    :tangle         no

And C-c C-v C-v, shows that the import statements in the header do not get
expanded into the code block.

So I am obviously doing something wrong. There appear to be no typos or misspellings and the org file containing the coded is exactly this:

* Test of prologue header

:header-args:python+: :prologue "import numpy as np; import os"

#+BEGIN_SRC python :results output


My init file has no org babel header arguments defined.

I am using C-c C-v C-b or C-c C-v C-s to evaluate and I get

"Code block produced no output." in the mini-buffer.

If I use C-c C-c directly on the code block itself I get:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'np' is not defined

Is there something else I need to do to get babel to recognize the header-args?


On 8/7/20 12:51 PM, Berry, Charles wrote:

On Aug 7, 2020, at 8:39 AM, William McCoy <wdm8588@gmail.com> wrote:

This use of :prologue appeared to me to be very useful. But for some reason when I try it out it does not work for me. I just get a message that the code block produced no output and that 'np' is not defined. Just to check, when I put the import statements directly within my code block it works fine.

I am running:  Org mode version 9.3.7 (9.3.7-16-g521d7f-elpa

Any idea what I'm doing wrong?

It is sometimes useful to use C-c C-v C-i to see what header args org has detected for a source block. Misspelled words sometimes wreak havoc and invisible characters can cause real pain.

Also, it helps to use C-c C-v C-v to to see the expanded code block. When I do this with Kens' ECM, I get

import numpy as np; import os

in the preview buffer.



On 8/6/20 2:12 PM, Ken Mankoff wrote:
Actual example:

* Prologue test
:header-args:python+: :prologue "import numpy as np; import os"

#+BEGIN_SRC python :results output

: 1.18.4

On Wed, Aug 5, 2020 at 3:03 PM Ken Mankoff <mankoff@gmail.com> wrote: What about using :pre or :prologue and setting it at the header or document level?

Please excuse brevity. Sent from tiny pocket computer with non-haptic-feedback keyboard.

On Wed, Aug 5, 2020, 14:22 George Mauer <gmauer@gmail.com> wrote:
Use case:

I'm using ob-racket but this would apply just as well to a few other workflows I have with python or js.

I would like to write a helper function in a src block and then automatically have access to it in other src blocks further down the document. I don't really want a stateful session (nor does ob-racket support sessions) so I essentially want the equivalent of automatically including it everywhere so I don't have to type it out all the time (and have it screw up syntax coloring/indentation).

Is this currently possible? Does anyone have any ideas for how to extend things so it is?

Thomas S. Dye

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