On 14.12.2017 5:25, Nathaniel Smith wrote:
On Wed, Dec 13, 2017 at 6:11 PM, Ivan Pozdeev via Distutils-SIG
<distutils-sig@python.org> wrote:
On 14.12.2017 3:17, Barry Warsaw wrote:
I'm about to release a new version of importlib_resources, so I want to
get my flit.ini's require-python clause right. We support Python 2.7,
and 3.4 and beyond. This makes me sad:
requires-python = '>=2.7,!=3.0,!=3.1,!=3.2,!=3.3'
Of course, I'd like to write this like:
requires-python = '(>=2.7 and <3) or >= 3.4'
I understand that OR clauses aren't supported under any syntax
currently, but as PEPs 566 and 508 are still open/active, wouldn't it be
reasonable to support something like this explicitly?
It seems like wanting to support 2.7 and some versions of Python 3 (but
not all) is a fairly common need.
What you're actually asking for is for the >= operator to be limited to a
specified major version.
We actually have the ~= operator that's basically that-- not sure if
it's allowed in requires-python. But that's not sufficient. You also
need an "or" primitive if you want to express "~= 2.7 or ~= 3.4".
Right now all you could write is "~= 2.7 and ~= 3.4", which is the
null set :-).
If my logic algebra memory serves me right, `or' can be changed to `and'
and vice versa by lowering or raising a negation line:
~= 2.7 or ~= 3.4 <=> !!(~= 2.7 or ~= 3.4) <=> !(!~=2.7 and !~=3.4)
But you need superposition (the brackets) for that.
--
Regards,
Ivan
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