PEP suggestion: Uniform way to indicate Python language version

[rocky]

The assertion should have been 

  assert sys.version >= (3, 0)

If we want to indicate the Python program supports language versions 3.0 and greater.

On Sunday, August 21, 2016 at 3:59:48 PM UTC-4, Vincent Vande Vyvre wrote:
> Le 21/08/2016 à 20:28, rocky a écrit :
> > The problem:
> >
> > 1. there are various code inspection tools that parse Python programs looking for style issues or whatnot. The deeper ones have to do a full parse of the python program. It would be helpful if there were a uniform way to indicate the Python language level used in Python source code.
> >
> > 2. I get a standalone python program that is not part of a package. vcprompt https://bitbucket.org/gward/vcprompt might be an example
> > It would be helpful if there were an easy way to know what language version of Python it assumes
> >
> > Perl has something like called "use perl".  "use" is roughly equivalent to "import".
> >
> > Possible solutions:
> >
> > Do it the similar to "use perl". Here "perl" is a package that just tests the parameter given it. In Python such the code would look something like
> >
> > File/module python30.py
> >
> >     import sys
> >     assert sys.version >= (sys.version_info >= (3, 0))
> >
> > The above works, but to reduce proliferation of packages it might be preferable to come up with some way to pass a version specification string similar to the specification strings allowed in setup.py
> >
> > A metadata tag as a comment in a docstring or in a comment.
> > Preferably this would be given towards the top of the file to make it easier for tools to extract this information.
> >
> > Thoughts?
> 
> I don't understand your assertion
> 
> Python 3.2.3 (default, Jun 18 2015, 21:46:42)
> [GCC 4.6.3] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
>  >>> import sys
>  >>> assert sys.version >= (sys.version_info >= (3, 0))
> Traceback (most recent call last):
>    File "<stdin>", line 1, in <module>
> TypeError: unorderable types: str() >= bool()
> 
> 
> What you means ?
> 
> -- 
> Vincent V.V.
> Oqapy <http://www.oqapy.eu> . python3-exiv2 
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