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Python: If there are multiple egg versions of the same package installed, how do I import specifically the version I need?

Say, for example that FooPackage-1.1 and FooPackage-1.2 are both installed in dist-packages as eggs. How do I import the one I need?

Solution

  • You can use pkg_resources to specify your requirements at import time:

    import pkg_resources
pkg_resources.require('FooPackage==1.2')
import FooPackage

    For example:

    % easy_install simplejson==2.1.3
% easy_install simplejson==2.1.2

pkg_resources.require('simplejson==2.1.2')
import simplejson
assert simplejson.__version__ == '2.1.2'