Re: What are reasonable compatibility tags? (was: Three clarification questions about PEP 425 and PyPy3

On Fri, 31 Aug 2018 at 13:33 Xavier Fernandez <[email protected]>
wrote:

>
>
>
> Le ven. 31 août 2018 à 9:25 PM, Brett Cannon <[email protected]> a écrit :
>
>>
>> OK, so let's look at what we're trying to support. If we have pure Python
>> code there's very likely going to be a bottom Python version that's
>> supported and then forward-compatibility is assumed. This is specified
>> today through python-requires, so having a specific Python version in the
>> wheel itself isn't totally critical. So 'py3-none-any' combined with
>> python-requires takes care of this the vast majority of the time.
>>
>
> Hello,
>
> while python-requires is indeed nice, it is only usable by pip to select a
> wheel file with a fully compliant PEP 503 repository.
> Otherwise, like in a local wheelhouse (wheel files in a directory), it is
> invisible to pip until pip tries to install the wheel so a more precise
> python tag can still be somewhat useful...
> (I agree that pip could access the wheel metadata to check the
> python-requires without needing to unzip the whole file).
>

You can make your pure Python wheel have a py3-cp36m-* wheel name and you
get the version specification you want; there is nothing saying a wheel
must have extension modules if it specifies an ABI tag.

But more importantly, pip still has to resolve what version of a package to
use, so regardless of what's cached in your wheelhouse there will be a
check against python-requires somewhere, else you're no worse off than just
installing the wheel directly. IOW your wheelhouse isn't going to
short-circuit pip's resolver, it's just going to save you from having to
download some bits from somewhere else (unless I understand how pip
utilizes the wheelhouse on disk).

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