python - Jupyter notebook can't load installed package in conda environment

Question

I've created a conda environment:

$ conda create --name py3 matplotlib scipy astropy photutils

Everything installed properly, including the photutils package that is installed from the http://ssb.stsci.edu/astroconda channel.

Now I activate the environment and open a Jupyter notebook:

$ source activate py3
(py3) $ jupyter notebook

With py3 as the Default environments, and photutils installed

I open a new notebook that uses the Default kernel and attempt to load photutils

which will not work.

What is going on here? The only thing that I find strange is that the name of the photutils package is shown as http://ssb.stsci.edu/astroconda::photutils0.4 by Jupyter in the Conda tab. Is this the issue? If so, how can I fix this?

Answer 1

The default kernel is installed in the environment where the Jupyter Notebook is installed. You either need to either 1) install the notebook pacakge in the py3 environment, or 2) install the ipykernel package in the py3 environment and launch the Notebook server from the root environment, then start a new Notebook with the (now newly added) py3 kernel.