On Thu, Sep 12, 2013 at 12:24 PM, Vinay Sajip <vinay_sa...@yahoo.co.uk> wrote: > Paul Moore <p.f.moore <at> gmail.com> writes: > >> I'd say yes, raise an issue on the pip tracker. At a minimum, it will >> ensure that the issue is discussed and the conclusion recorded. > > Okay, will do. > >> Personally, I'd say that zipping up pip should work. Whether it's >> valid to require people to include dist-info directories in zips, as >> Daniel says, I'm not sure - maybe it should be a requirement, but if >> so, then the python docs on how to zip up files to make executable >> zips should document this (potential) requirement. > > I don't believe it should be a requirement - wherever possible, Python code > shouldn't need to be installed into a site-packages in order to work. > >> Without seeing the surrounding code, I can't say whether the use of >> pkg_resources here is valid. > > Since in each case here it's just checking versions, I would say that it's > not really necessary. These are the only two cases in pip where it's > searching using string literals 'setuptools' and 'pip' - as these are > actually a dependency and pip itself, it shouldn't really need to look for > an installed distribution, since the fact that it's running means that > (under normal circumstances) it's using imported code rather than installed > code (which is what leads to the errors, of course). > > Regards, > > Vinay Sajip
In wheel's case the idea was to have pip verify that the optional dependency is new enough to work. The part inside pip could be changed to try: import wheel; check(wheel.__version__). IIRC the pip process itself does not directly use anything inside wheel and does not need to "import wheel". However "setup.py bdist_wheel ...", run by pip in a subprocess, will not work unless setuptools can find wheel's plugin declaration. That won't work unless wheel's *.dist-info/entry_points.txt on sys.path. It is true that pip has a greater dependency on "knowing what's installed" than most Python software and therefore needs the -info directories that provide the installation database. Programs that are not installers and do not use entry_points usually do fine with just "try: import x". _______________________________________________ Distutils-SIG maillist - Distutils-SIG@python.org https://mail.python.org/mailman/listinfo/distutils-sig
