Bug#737376: texlive-extra-utils: Debian pythontex can't use python3

[Julian Gilbey <jdg@debian.org>]

On Wed, Feb 12, 2014 at 07:33:01AM +0900, Norbert Preining wrote:
> > Much more interesting would be if the /usr/bin/pythontex3 were to
> > include the argument --interpreter python:python3 before "$@", for
> 
> Did you see the scripts I have added to the texlive-extra tree
> and that will be installed?
> 	texlive-nonbin.git/texlive-extra-debian/pythontex3
> is nothing else but:
> if which python3 >/dev/null 2>&1
> then
>   python3 /usr/share/texlive/texmf-dist/scripts/pythontex/pythontex3.py "$@"
> else
>   echo "You need to have python3 installed to be able to use" >&2
>   echo "the Python 3 version of pythontex!" >&2
>   echo "Exiting." >&2
> fi
> 
> That is why I wrote in the last email that I used your script, but changed
> the exec to a call to python3 ...

Indeed.  I wrote that script before I understood what pythontex3 did.
Geoffrey wrote to me (but forgot to copy in the bug report):

>> Julian,
>> 
>> In the latest beta relase, I've modified the hashbangs in
>> `pythontex2.py` and `pythontex3.py` to `env python2` and `env
>> python3`.  If no bugs are found in the next several days, I will
>> release to CTAN and then it will be available for TeX Live.
>> 
>> One thing I forgot to mention.  The version of Python that launches
>> PythonTeX is primarily used to manage/oversee code execution...and
>> this version doesn't really matter (except for highlighting and
>> console emulation).  The version of Python that is actually used to
>> run user code from the document is determined by what `python` gives
>> on the command line.  This can be customized with the `--interpreter`
>> option.  For example, `pythontex --interpreter python:python3
>> file.tex` would call the temporary scripts that PythonTeX uses with
>> `python3 <temp_script>`.
>> 
>> Geoff

So...

> That should suffice, though, right?

So in its current form it doesn't actually achieve anything of value.
But changing the call to read:

  python3 /usr/share/texlive/texmf-dist/scripts/pythontex/pythontex3.py \
    --interpreter python:python3 "$@"

would actually make it do what people would expect, which is to use
python3 to process the code in the LaTeX document.

   Julian