The command I am using:

docker build . \
--build-arg FROM=loci-base:ubuntu \
--build-arg PYTHON3=yes \
--build-arg PROJECT=trove \
--tag loci-trove:ubuntu

The error: http://paste.openstack.org/show/791311/

Then I changed pydep.txt:

uwsgi           [!trove]

and ran again, another error occured: http://paste.openstack.org/show/791313/

However, if removed '--build-arg PYTHON3=yes' in the command (even without modifying pydep.txt), the image could be built sucessfully. Does LOCI support to build Python 3 image or I did something wrong?