Sed wrote:
> Hello,
>
> I thought that with eggs, I will be able to choose at run time, which
> version of an egg I would like to use.
>
> But after some tests with dummy eggs, I've tried to make it work with
> SQLAlchemy for example, with no success at all.
>
> So does some one know if such feature is available with eggs ??
>
> ------------------ the example ---------------
>
> easy_install 'SQLAlchemy==0.4.4'
> ...
> easy_install 'SQLAlchemy==0.4.6'
> ...
>
> python
> import pkg_resources
>>>> pkg_resources.require("SQLAlchemy==0.4.6")
> [SQLAlchemy 0.4.6 (/home/system/briner/py-lib/SQLAlchemy-0.4.6-
> py2.5.egg)]
>>>> pkg_resources.require("SQLAlchemy==0.4.4")
> 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: (SQLAlchemy 0.4.6 (/home/system/briner/
> py-lib/SQLAlchemy-0.4.6-py2.5.egg),
> Requirement.parse('SQLAlchemy==0.4.4'))
>
> Ctrl+D
>
> easy_install 'SQLAlchemy==0.4.4'
> ...
> python
>>>> import pkg_resources
>>>> pkg_resources.require("SQLAlchemy==0.4.4")
> [SQLAlchemy 0.4.4 (/home/system/briner/py-lib/SQLAlchemy-0.4.4-
> py2.5.egg)]
>>>> pkg_resources.require("SQLAlchemy==0.4.6")
> 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: (SQLAlchemy 0.4.4 (/home/system/briner/
> py-lib/SQLAlchemy-0.4.4-py2.5.egg),
> Requirement.parse('SQLAlchemy==0.4.6'))
>
> -------------------------------
> so it feels that the only package I can call is the latest one
> installed !!!
you need to easy_install with -m/--multi-version. All of your packages.
Diez
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