[Distutils] patch: solving the two major things that people dislike about setuptools, part 1
zooko at zooko.com
Tue Nov 25 21:29:09 CET 2008
On Nov 24, 2008, at 15:46 PM, Mark Sienkiewicz wrote:
> We can eliminate __egginsert from the code entirely. As far as I
> can tell, the *only* purpose of __egginsert is to permit the
> incorrect behaviour that your patch is intended to fix.
There are two separable concerns here:
1. Should the act of "easy_install foodistribution" cause subsequent
"python -c 'import foomodule'" to get the new, easy-installed foo,
instead of the pre-existing, distutils-installed foo which is in the
2. Should the act of "PYTHONPATH=./my-custom-foo" cause subsequent
"python -c 'import foomodule'" to get the foo in ./my-custom-foo
instead of the easy-installed foo?
PJE has already made clear (see references on the ticket that I filed
or in my earlier mail) that he wants the answer to 1 to be "yes",
because he is supporting a common use case in which a user doesn't
know how to uninstall the old foo but wants to use easy_install to
get a new foo.
(I personally am kind of ambivalent about #1, but I have no users
asking for it to be different so I'm happy to go along with PJE on
Issue #2 is actually the one that so many people hate about
setuptools, including many of my current and prospective users, and
apparently included you, Mark Sienkiewicz.
I think it is consistent to answer "yes" to both questions, because
in each case the user has expressed intent -- by saying "easy_install
foo", you can legitimately be understood as meaning "...and make the
one I get over-ride any other ones that might already be here.".
Likewise by saying "PYTHONPATH=./my-custom-foo", you are certainly
saying "... and make the one I just named override any others".
Indeed, the Python docs clearly state that Python will respect that
statement of yours:
which says: "The PYTHONPATH variable can be set to a list of paths
that will be added to the beginning of sys.path.".
My patch is intended to make the answer to #2 be "yes" from now on,
while preserving the current behavior of the answer to #1 being "yes".
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