There was a recent issue having to do with virtualenv 1.8.3 upgrading it's bundled distribute to 0.6.30 which triggered a build failure in numpy due to some legacy code. see https://github.com/numpy/numpy/issues/2761. It manifests as an exceptin complaining of a "detached stdout"
virtualenv 1.8.4 was released, with distribute 0.6.31 which fixes the issue, and now I can create a virtualenv py3 environment and install numpy.
however using tox -e "py32" with a package that installs numpy
still produces the "detach" error. I've upgraded my system distribute
and virtualenv to 0.6.32 and 1.8.4 respectively, pulled the latest 1.4.2
tox from pypi, removed the .tox directory and recreated the environments
and am still getting the error, which makes tox unusable for me.
If I manually activate the py32 venv created by tox and use
pip install numpy the setup succeeds.