I am running SageMath in MacOS with the built-in Jupyter notebook.
I have tried the following installation
(1) in terminal
sage -pip install jupyterthemes
(2) inside the jupyter notebook
!pip install jupyterthemes
!pip3 install jupyterthemes
!python3 -m pip install jupyterthemes
But in any case, running !jt in the notebook always returns
zsh:1: command not found: jt
I wonder how to make it work?