"Eric Schulte" <schulte.eric@gmail.com> writes:

> Hi,
>
> I've just pushed up a new prefix header argument.

"preamble" might be a better name? or "header"? prefix makes me think of
adding a string onto the front of a string[1]; preamble and header are
used by e.g. latex to refer to prelimary lines at the top of a file. For
obscure options like this it might be OK to use a longer name
(e.g. ":header-line"), especially now we have multiline header args
with #+header.

>  This header argument
> only has meaning for python code blocks

but might in the future be used by others?

Dan

[1]: accurate i know, but many people won't think of a block as a
character string.


> (since it is tied into
> evaluation each language would have to handle it separately).  This is
> only used during external evaluation (i.e. not when :session is
> specified) and the value of the :prefix argument is prepended to the
> temporary file evaluated by python.
>
> The following demonstrate its usage:
>
> ** Python requires a utf-8 coding prefix
> #+begin_src python :prefix # -*- coding: utf-8 -*- :return s
> s = "é"
> #+end_src
>
> #+results:
> : é
>
> #+begin_src python :prefix # -*- coding: utf-8 -*- :results output
> s = "é"
> print(s)
> #+end_src
>
> #+results:
> : é
>
> Best -- Eric
>
> Vincent Beffara <vbeffara@ens-lyon.fr> writes:
>
>> Hi,
>>
>>> I would suggest just trying it out first and seeing if you get an error
>>> without such a line.
>>
>> Well, I do, that's why I'm asking ;-)
>>
>>> Also, you could try adding the line to the beginning of your code
>>> block.
>>
>> I tried like this :
>>
>> #+begin_src python
>> # -*- coding: utf-8 -*-
>> s = "é"
>> #+end_src
>>
>> The error message tells me that the error happens on line 4, hence the
>> coding line ends up on line 3, and python only takes it into account if
>> it is one of the first two ... so it almost works, but it doesn't.
>>
>>> If there is definitely a problem please reply to this thread and we
>>> could easily add a header argument for this case, possibly named
>>> ":prefix" which could be used to specify such a code-block-prefix for
>>> code evaluation.  This header argument could then be set globally or on
>>> the file, heading, or code block level.
>>
>> That would be fantastic ! (And possibly useful in other cases as well
>> ...)
>>
>> Thanks,
>>
>>         /vincent
>>
>>
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