Removing Kernels
$ ls -alt ~/Library/Jupyter/kernels/
total 0
drwx------ 6 uki staff 192 Oct 23 07:45 ../
drwxr-xr-x 5 uki staff 160 Oct 23 07:43 ./
drwxr-xr-x 5 uki staff 160 Oct 23 07:43 py27/
drwxr-xr-x 5 uki staff 160 Sep 30 19:59 python2/
drwxr-xr-x 3 uki staff 96 Jan 23 2018 bash/
$ rm -r ~/Library/Jupyter/kernels/python2/
See my post on:
Installing Jupyter kernels to match Conda environments
https://ukidlucas.blogspot.com/2018/10/ipykernel.html