[Distutils] [proposal] version-free + lookup-friendly dist-info location

[Ronny Pfannschmidt]

btw, thats irrelevant for dist-info
either it gets found double and is a problem
or its priority-overridden

On 17.03.2017 15:00, Paul Moore wrote:
> On 17 March 2017 at 13:34, Donald Stufft <donald at stufft.io> wrote:
>> Hmm, I believe it generally works fine does it not? The only situations I
>> can think of where it does something funny are:
>>
>> (1) PEP 420 namespace packages where a file was added or removed in one of
>> the versions (since that is impossible to differentiate from two different
>> projects using the same namespace)
>> (2) Uninstalling/Installing the same package during the lifetime of a
>> process (which is already going to break in weird ways).
>>
>> What scenarios are you seeing two installs of the same package into
>> different sys.path directories fail?
> I don't have an actual failure, although I do think I've seen reports
> in the past - it's definitely something that's come up in previous
> discussions.
>
> As a theoretical example:
>
> foo 1.0 looks like this:
>
>     foo
>         __init__.py
>         bar.py
>
> foo 2.0 moves the functionality of foo/bar.py into baz.py
>
>     foo
>         __init__.py
>         baz.py
>
> Put both of these on sys.path, then you can successfully import
> foo.bar and foo.baz. Which is of course wrong. Furthermore, which
> version of foo/__init__.py gets imported depends on which version of
> foo is first on sys.path, so one of bar and baz will be using the
> wrong foo.
>
> IMO, of course, the answer is simply "don't do that". But I'm OK with
> simply leaving things as they stand if no-one else thinks it's worth
> making an issue of it.
> Paul
> _______________________________________________
> Distutils-SIG maillist  -  Distutils-SIG at python.org
> https://mail.python.org/mailman/listinfo/distutils-sig