Activate virtualenv in Ant

Question

Is there a way to activate a newly created virtualenv within an Ant script such that any calls to <exec executable="python"> (site-packages lookups etc) uses the virtualenv and not the global shared path?

I should note that a solution must work on Windows, Linux and Mac.

Answer 1

You can refer directly to the executable in the virtualenv:

<exec executable="<virtual_env_dir>/bin/python">
...

This will automatically use the packages installed in the virtualenv rather than those in the base install.