On Dec 8, 2009, at 3:00 PM, Ning wrote:
> Hello
>
> I am new to python. I have got two version of SQLAlchemy, 0.4.0 and
> 5.5.
>
> Some of my old script built in 0.4.0, and I do not want to change the
> script.
>
> Is that any way I can define in the script to use SQLAlchemy 0.3.11
> for my old script and 5.5 for my new script?
>
> I think you can use pkgresources to determine which version of
> sqlalchemy to be imported. but it is not working, please see my code
> below:
>
> In [23]: from pkg_resources import require
> In [24]: require('sqlalchemy == 0.4.0')
> Out[24]: [sqlalchemy 0.4.0 (c:\pythonxy\python26\lib\site-packages
> \sqlalchemy-0.4.0-py2.6.egg)]
> In [25]: import sqlalchemy
> In [26]: sqlal
> sqlalchemy sqlalchemy-0.4.0-py2.6.egg sqlalchemy-0.5.6-py2.6.egg
> In [26]: sqlalchemy.__version__
> Out[26]: '0.4.0'
>
> That is file, but when i try to load version 5.6. It said got version
> conflict
>
> In [28]: require('sqlalchemy == 0.5.6')
> ---------------------------------------------------------------------------
> VersionConflict Traceback (most recent call last)
>
> C:\Pythonxy\Python26\Lib\site-packages\<ipython console> in <module>()
>
> C:\Pythonxy\Python26\Lib\site-packages\pkg_resources.pyc in require
> (self, *requirements)
> 624 """
> 625
> --> 626 needed = self.resolve(parse_requirements(requirements))
> 627
> 628 for dist in needed:
> C:\Pythonxy\Python26\Lib\site-packages\pkg_resources.pyc in resolve
> (self, requirements, env, install
> er)
> 526 if dist not in req:
> 527 # Oops, the "best" so far conflicts with a dependency
> --> 528 raise VersionConflict(dist,req) # XXX put more info here
> 529 requirements.extend(dist.requires(req.extras)[::-1])
> 530 processed[req] = True
> VersionConflict: (sqlalchemy 0.4.0 (c:\pythonxy\python26\lib\site-
> packages\sqlalchemy-0.4.0-py2.6.egg), Requirement.parse
> ('sqlalchemy==0.5.6'))
To be able to switch between two versions of a package with
pkg_resources.require you'll need to install both with the multi-version (-m)
argument to easy_install.
--
Philip Jenvey
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