Re: python -> python2

Most of the python scripts are maintained by me(Darcy Shen).


$ git grep "env python3"

misc/admin/pr:#!/usr/bin/env python3
plugins/tmpy/session/tm_tikz.py:#!/usr/bin/env python3


I found that two of the python scripts use "#!/usr/bin/env python3", I 
will fix it later.

Currently, we use Python 2 as an alternative to run the python scripts.

We will try to keep Python 2 compatibility, but Python 3 is preferred.


On 2020/7/27 上午4:30, Sebastian Miele wrote:
> On current Arch Linux, 'python --version' reports 'Python 3.8.3'. The
> most recent Arch Linux package for TeXmacs contains TeXmacs 1.99.12. Its
> PKGBUILD contains:
>
>    find -name '*.py' | xargs sed -i 's/env python/env python2/'
>
> The first line produces incorrect results on the current trunk/src,
> because today there are python scripts with 'env python3', which
> gets changed to 'env python23'.
>
> I do not know Python. But I suspect that something like the
> following is the case: In the past, just 'python' unambiguously
> meant Python 2. At least on some systems there was no 'python2',
> even if Python 2 was installed. Because of that 'python' was used
> instead of 'python2' in TeXmacs.
>
> Today the situation is different: Just 'python' means Python 3 at
> least on Arch Linux. I strongly suspect that assumption A holds,
> where A is: On recent systems, installing Python 2 always provides
> a 'python2' in the path. If not, it can be considered to be a bug
> of that system.
>
> In fact, files like plugins/xypic/progs/init-xypic.scm today
> consistently contain:
>
>    (define (python-command)
>      (if (url-exists-in-path? "python3") "python3" "python2"))
>
>    (define (python-exists?)
>      (or (url-exists-in-path? "python3")
>          (url-exists-in-path? "python2")))
>
> I do not understand the details. But almost certainly it means: A
> already is assumed there.
>
> Therefore I recommend the following: Run
>
> : find -name '*.py' | xargs sed -i 's/env python$/env python2/'
>
> (note the added '$') on trunk/svn and commit.
>
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