PEP suggestion: Uniform way to indicate Python language version

[Chris Angelico]

On Mon, Aug 22, 2016 at 3:35 PM, Steven D'Aprano
<steve+comp.lang.python at pearwood.info> wrote:
> Could somebody (the OP?) please explain what is the purpose of this proposal,
> what it does, how it works, and when would people use it?

My theory: A directive is actually parsed by the compiler, not
executed at run-time. So you could have a clean ImportError that says
that you need a particular version, rather than a SyntaxError because
you used "async def". But given that you can't recover from it without
the same "import mymodule2 as mymodule" trick anyway, there's not that
much difference.

ChrisA