20:06 $ which python
/usr/local/bin/python
✔ ~
20:09 $ which pip
/Users/username/bin/pip
✔ ~
20:10 $ which jupyter
/usr/local/bin/jupyter
✔ ~
20:10 $ jupyter notebook
Traceback (most recent call last):
  File "/usr/local/bin/jupyter", line 7, in <module>
    from jupyter_core.command import main
ImportError: No module named jupyter_core.command
✘-1 ~
20:10 $ sudo jupyter notebook
Password:
[I 20:10:47.639 NotebookApp] The port 8888 is already in use, trying another random port.