Re: Update PEP 508 to allow version specifiers

Thanks Jan for raising this issue.

On Tue, Jan 29, 2019 at 10:21 AM Tzu-ping Chung <[email protected]> wrote:

> I’m wondering, why is it needed to specify both a version and a link? I
> assume the version specifier would be redundant when a link is provided
> as the source, since the link can only point to one possible package
> version.
>

The same could be said from the package name: when a link is provided, the
name is redundant since the link can only point to one possible package
name.

If a version specifier was allowed for direct references, this would the
same thing: it would be the installer job to check that the provided link
matches the provided version specifier, just like it should be checking
that the package name matches ;).
If the direct references was inconsistent, the installer could print a
warning or abort the installation.

Currently with pip 19, an inconsistent name in a direct reference only
produces a warning.
With a setup.py containing
from setuptools import setup
setup(name='foo', version='1',
  install_requires=['toto @
https://files.pythonhosted.org/packages/06/18/fa675aa501e11d6d6ca0ae73a101b2f3571a565e0f7d38e062eec18a91ee/mccabe-0.6.1.tar.gz'
])

"pip install . --no-cache-dir" ends up (unhappily & with a few warnings)
with mccabe 0.6.1 installed.

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