[Distutils] PEP439 and backward compat / easy_install / distlib
holger at merlinux.eu
Sun Mar 24 10:48:40 CET 2013
Hi Richard, all,
two first notes on PEP439.
backward compat with present-day release files: the PEP should state
it as a goal or at least discuss it in some depth. In that context, the
choice of providing a bootstrap for pip rather than easy_install needs
reasoning. One problem with pip, compared to easy_install, is
that it doesn't support eggs which is a problem particularly on
Windows machines where often no fitting C compiler is available. If the
remedy here is to support wheels and recommend it's use, it is still a
backward compatibility problem: many users will not be able to use the
builtin-supported installer to install todays existing egg release files.
setuptools and distlib: Even if Python3.4+ had a mature distlib
providing minimal setuptools functionality, how would it work for the
typical "python setup.py install" which is invoked by pip? Often those
setup.py scripts depend on a setuptools package.
I am highlighting these two backward-compat aspects because otherwise
we might run into this problem: http://xkcd.com/927/ and i understood
that most people involved in improving the packaging ecology want
to avoid that :)
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