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Re: [O] Bug: Tangling python code results in mixed tabs and spaces, inco

From: Nicolas Goaziou
Subject: Re: [O] Bug: Tangling python code results in mixed tabs and spaces, incomaptible with python3 [9.1.4 (9.1.4-dist @ /home/ehere/emacs-scripts/org-9.1.4/lisp/)]
Date: Thu, 21 Dec 2017 14:56:04 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.3 (gnu/linux)


Edmund Christian Herenz <address@hidden> writes:

> The following python code uses only whitespaces for the different
> indentdation levels:
> a_list = ['elem1',
>           'elem2',
>           'elem3']
> for elem in a_list:
>     print(elem)
>     for char in elem:
>         print char
> I enter this code into a SRC block with
> #+BEGIN_SRC python :tangle blank_test.py
> by pressing C-' inside the block (which opens the editing buffer
> python-mode).  Then I press C-' again, after which I tangle the code
> to blank_test.py by pressing C-u C-c C-v C-t.  The resulting file
> blank_test.py will contain a mix of tabs and spaces for the different
> intendation levels.  (I checked this with whitespace.el).
> Above behaviour is a bug, since Python3 forbids mixing of spaces and
> tabs. (Python2 is more relaxed about mixing of tabs and spaces). Thus,
> the above code, syntactical correctly entered into an OrgSrc buffer,
> will result in code that can not be run in python3 when tangled from
> an org-mode file.

Have you tried "-i" switch for the block, i.e.,

  #+BEGIN_SRC python -i :tangle blank_test.py


Nicolas Goaziou

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