Jupyter error: "No module named jupyter_core.paths"
Question: Trying to open Jupyter Notebook (OSX 10.11.4) I get the following error:

    
    
    $ jupyter-notebook
    Traceback (most recent call last):
      File "/usr/local/bin/jupyter-notebook", line 7, in <module>
        from notebook.notebookapp import main
      File "/Users/geotheory/Library/Python/2.7/lib/python/site-packages/notebook/__init__.py", line 25, in <module>
        from .nbextensions import install_nbextension
      File "/Users/geotheory/Library/Python/2.7/lib/python/site-packages/notebook/nbextensions.py", line 23, in <module>
        from jupyter_core.paths import jupyter_data_dir, jupyter_path, SYSTEM_JUPYTER_PATH
    ImportError: No module named jupyter_core.paths
    

This used to work. Any idea how to diagnose?


Answer: I have encountered similar issue. Basically, I solved it by uninstall
python2.7 and re-install newer python & IPython versions.

Details on how to effectively uninstall python2.7 via Mac OS command line is
here: [How to uninstall Python 2.7 on a Mac OS X
10.6.4?](http://stackoverflow.com/questions/3819449/how-to-uninstall-
python-2-7-on-a-mac-os-x-10-6-4)

Re-install desired version of IPython via command line. In my case, I also
needed to re-install Jupyter via:

    
    
    pip install jupyter

Good luck.

