Thanks for the details @BioMickWatson! It looks like you have Python 3.4 and Python 3.5 conflicting with each other (specifically with the pandas package, which is a QIIME 2 dependency).
Can you please provide the output from running the commands below? First run all of the commands with the qiime2-2017.12 environment deactivated, then run the commands again with the qiime2-2017.12 environment activated. Some of the commands are expected to fail; please run them anyways and provide the output. Hopefully this will give me enough info to figure out what's going on!
Debug commands:
uname -a
echo $PATH
echo $PYTHONPATH
echo $PYTHONHOME
ls -la $HOME/.local/lib
which python
python --version
alias python
which qiime
which conda
conda info -a
conda list
python -c "import pandas"
Thanks!