[x3d-public] python 2.7 complains about x3d.py -- and will continue to do so

[vmarchetti at kshell.com]

The refence John Carlson identified suggests using a 'processing instruction' as the first line of the x3d.py file, the line would be:
# -*- coding: utf-8 -*-
and this allows the Python 2 interpreter to read the source file assuming UTF-8 encoding; for the current download of x3d.py (as of 12 June 2020) this works, Python 2 accepts the non-ascii character (in this case, the non-ascii character is the "MULTIPLICATION_SIGN" , unicode 215, used in a documentation comment.)

However, elsewhere in the x3d.py, the print({text}) form of the Python print statement is used, and that is only permitted in Python 3.

As it is written now, x3d.py is only supported by Python 3. I think this is a reasonable choice.

Vince Marchetti


> On Jun 12, 2020, at 12:31 AM, John Carlson <yottzumm at gmail.com> wrote:
> 
> https://www.python.org/dev/peps/pep-0263/ <https://www.python.org/dev/peps/pep-0263/>   (declaring an encoding)
> 
> On Thu, Jun 11, 2020 at 2:20 PM Andreas Plesch <andreasplesch at gmail.com <mailto:andreasplesch at gmail.com>> wrote:
> $ python 
> Python 2.7.16 (default, Oct 10 2019, 22:02:15)  
> [GCC 8.3.0] on linux2 
> Type "help", "copyright", "credits" or "license" for more information. 
> >>> import x3d.x3d as x 
> Traceback (most recent call last): 
>  File "<stdin>", line 1, in <module> 
>  File "/home/andreas/.local/lib/python2.7/site-packages/x3d/x3d.py", line 206 
> SyntaxError: Non-ASCII character '\xc3' in file /home/andreas/.local/lib/python2.7/site-packages/x3d/x3d.py on line 206, but no encoding declared; see http://python.org/de <http://python.org/de>
> v/peps/pep-0263/ for details
> 
> $ cat -nA  /home/andreas/.local/lib/python2.7/site-packages/x3d/x3d.py | grep 206 | head -1 
>   206      'SFMatrix3d', # Single Field (singleton) 3M-CM-^W3 matrix of double-precision floating point numbers$
> 
> There are indeed non-ascii characters.
> 
> python3 does not complain.
> 
> -- 
> Andreas Plesch
> Waltham, MA 02453
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