After modifying the background of jupyter notebook and adding jupyterthemes, enter 'JT -l' and the error 'JT' is not an internal or external command, nor a runnable program

1. Error reason

jupyterthemes It's loaded C:\Users\bs\AppData\Roaming\Python\Python37\site-packages in , However , This path is not in the environment variable PATH variable .
So we need to modify it PATH, Please refer to article .

2. Continue to operate

Reopen cmd/prompt, Input jt -l You can view the background information .
About background setting , May refer to article .