If you want to install jupyter with Python 2.7.x pip install jupyter
You'll get errors like:
When using Python 2.7, please install IPython 5.x LTS Long Term Support version.
Beginning with IPython 6.0, Python 3.3 and above is required.
You have to install ipython 5.x first by
sudo pip uninstall ipython
sudo pip install ipython==5.4.1
remember to add sudo!!
Then install jupyter
sudo pip install --no-cache-dir jupyter
Add --no-cache-dir to prevent pip using cached ipython6.0
Not working: https://aichamp.wordpress.com/2017/05/28/installing-ipython-5-0-lower-then-6-0-compatible-with-python-2-62-7/