I'm looking into pkg_resources.require as a possible solution to the
old/new problem of Routes and WebHelpers, to avoid having to release
Routes1 and WebhelpersOriginal packages. Pylons doesn't have a
top-level script unless people start making derivatives of 'paster',
but I thought maybe putting a requirement at the top of routing.py and
helpers.py would be enough.
When I've used 'require' in the past, it gave a warning if another
version of the package was already on sys.path. But now it gives an
error:
>>> pkg_resources.require("Mako==0.1.8")
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/lib/python2.5/site-packages/pkg_resources.py", line 626, in require
needed = self.resolve(parse_requirements(requirements))
File "/usr/lib/python2.5/site-packages/pkg_resources.py", line 528, in resolve
raise VersionConflict(dist,req) # XXX put more info here
pkg_resources.VersionConflict: (Mako 0.1.10
(/home/mso/venv/rlink/lib/python2.5/site-packages/Mako-0.1.10-py2.5.egg),
Requirement.parse('Mako==0.1.8'))
This makes 'require' useless in various hard-to-explain environments,
like if you're in a virtualenv and it's picking up another version
from site-packages, or if the other version is a Pylons dependency (as
in the case of Routes).
Another thing. I tried deleting the other Mako directory from
sys.path but i still go the error anyway.
--
Mike Orr <[EMAIL PROTECTED]>
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