Hi Matt,
It depends mainly on what Spyder sees as your current / default python.
Look at https://stackoverflow.com/questions/11919615/how-to-change-the-path-of-python-in-spyder 1
You installed python via pip right? So you can find out which python the pip is serving with:
pip --version

It will show something like:
pip 9.0.1 from /private/home/soumith/anaconda3/lib/python3.6/site-packages (python 3.6)

And that roughly gives you an idea of which python your pip is using.