Alexander> The quick hack to request a version, good to use in the Alexander> interpreter or a "throw-away" script: Alexander> import pkg_resources Alexander> pkg_resources.require('SQLAlchemy==0.4.5') Alexander> import sqlalchemy Alexander> This works when the directory that SQLAlchemy-0.4.5-py2.4.egg Alexander> is in is listed in sys.path. Thanks, however that raises a VersionConflict exception: >>> pkg_resources.require('SQLAlchemy==0.4.5') Traceback (most recent call last): File "<stdin>", line 1, in ? File "/opt/app/g++lib6/python-2.4.5/lib/python2.4/site-packages/setuptools-0.6c7-py2.4.egg/pkg_resources.py", line 626, in require needed = self.resolve(parse_requirements(requirements)) File "/opt/app/g++lib6/python-2.4.5/lib/python2.4/site-packages/setuptools-0.6c7-py2.4.egg/pkg_resources.py", line 528, in resolve raise VersionConflict(dist,req) # XXX put more info here pkg_resources.VersionConflict: (SQLAlchemy 0.3.3 (/opt/app/g++lib6/python-2.4.5/lib/python2.4/site-packages/SQLAlchemy-0.3.3-py2.4.egg), Requirement.parse('SQLAlchemy==0.4.5')) I need 0.3.3 to be the default version, but need to be able to import 0.4.5 for testing. Thx, Skip