[Distutils] wheels on sys.path clarification (reboot)

Daniel Holth dholth at gmail.com
Thu Jan 30 16:56:35 CET 2014

I see you've noticed wheel was released in an imperfect state.

Let's add a Zip-Safe flag to the WHEEL file, values of "true" and
"false" same as Root-Is-Purelib.


On Thu, Jan 30, 2014 at 10:44 AM, Eric V. Smith <eric at trueblade.com> wrote:
> Hash: SHA1
> On 01/30/2014 10:23 AM, Donald Stufft wrote:
>> On Jan 30, 2014, at 10:12 AM, Paul Moore <p.f.moore at gmail.com>
>> wrote:
>>> On 30 January 2014 15:03, Donald Stufft <donald at stufft.io>
>>> wrote:
>>>> For those following along at home who have no interest in
>>>> supporting zipped Wheels who want to disclaim support for it,
>>>> here's how you do zip_safe=False for Wheels:
>>>> https://gist.github.com/dstufft/8710270.
>>> Note that this will also prevent use in py2exe, cx_Freeze and
>>> any similar bundling technologies. Presumably that's what you
>>> want, as any issues are identical, but it's worth being clear.
>>> Paul
>> Sure, using a library via zip import when it wasn't designed to be
>> used as such is an anti pattern.
> The flag really needs to convey 2 meanings:
> - - There are some C extensions here that can't be loaded unless they
> live on a real filesystem path.
> - - There is some code (maybe in this package, maybe in another package
> that uses this one) that uses this package's __file__, and that code
> won't work unless __file__ points to a real filesystem path.
> There are any number of possible importers that would fail due to
> these 2 cases. I've personally written one that loads modules from a
> database. It should respect this flag, too.
> Which is a long way of saying: I think calling it "zip_safe" is a
> misnomer. The flag is really conveying "I don't need to be on a
> filesystem".
> Whether there should be 2 different flags for the two different
> problems (C extension and __file__), I can't say. They do seem to go
> hand-in-hand.
> Eric.
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