On Jan 29, 2014, at 11:50 PM, Tres Seaver <tsea...@palladion.com> wrote:
> Signed PGP part > On 01/29/2014 06:55 PM, Noah Kantrowitz wrote: > > > If you are going to document this, and it is not going to be > > explicitly supported by the spec (it isn't), the _only_ logical thing > > is to document that this is undefined behavior and while it works now, > > people should not depend on it. Under no circumstance should we > > document this as "well it works right now" without guidance about the > > fact that it isn't part of the spec and is _not_ a candidate for > > future design decisions. If someone would like to propose amending the > > spec that can happen separately, but as it stands right now this is > > nothing but convenient, undefined behavior. > > Nick's point in this thread is that zip-importability is a *necessary > corrolary* (not an implementation detaiL) of the "no special installers" > design choice. > > - Given that there is a non-empty set of wheels which can be unpacked > to a filesystem-directory tree in a directory on sys.path, and that > some of those wheels are already known not to otherwise break zip- > importability, it is a logical necessity that such wheels can be > put onto sys.path without unpacking. We already have existence proof > for this in software being released *by the folks who made these > specs*. > > Noting is as such is the *point* of Nick's change. > > > > Tres. > -- > =================================================================== > Tres Seaver +1 540-429-0999 tsea...@palladion.com > Palladion Software "Excellence by Design" http://palladion.com > > > _______________________________________________ > Distutils-SIG maillist - Distutils-SIG@python.org > https://mail.python.org/mailman/listinfo/distutils-sig Also it’s entirely inaccurate that Zip import must be maintained in order to support using unzip as a simple installer for simple Wheels. For instance if Wheels instead used directories at the root named after sysconfig scheme names then with your standard unzip tool you could simple do:: unzip example.whl 'purelib/*' Which is every bit as simple and not requiring a specialized installer but ends up breaking zip import compatibility (Techincally you'd just need to add the example.whl/purelib to the sys.path). However this is a change that wasn't off the table in the original PEP, it is now in the PEP-by-fiat because we now have to maintain zip import compatibility. ----------------- Donald Stufft PGP: 0x6E3CBCE93372DCFA // 7C6B 7C5D 5E2B 6356 A926 F04F 6E3C BCE9 3372 DCFA
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