I'm actually using Mac EI Capitan. I want to install the iPython and need to utilize iPython notebook
Requirement already satisfied (use --upgrade to upgrade): ipython in /Library/Python/2.7/site-packages
Requirement already satisfied (use --upgrade to upgrade): traitlets in /Library/Python/2.7/site-packages (from ipython)
Requirement already satisfied (use --upgrade to upgrade): pickleshare in /Library/Python/2.7/site-packages (from ipython)
Requirement already satisfied (use --upgrade to upgrade): simplegeneric>0.8 in /Library/Python/2.7/site-packages (from ipython)
Requirement already satisfied (use --upgrade to upgrade): decorator in /Library/Python/2.7/site-packages (from ipython)
Requirement already satisfied (use --upgrade to upgrade): gnureadline in /Library/Python/2.7/site-packages (from ipython)
Requirement already satisfied (use --upgrade to upgrade): appnope in /Library/Python/2.7/site-packages (from ipython)
Requirement already satisfied (use --upgrade to upgrade): pexpect in /Library/Python/2.7/site-packages (from ipython)
Requirement already satisfied (use --upgrade to upgrade): ipython-genutils in /Library/Python/2.7/site-packages (from traitlets->ipython)
Requirement already satisfied (use --upgrade to upgrade): path.py in /Library/Python/2.7/site-packages (from pickleshare->ipython)
Requirement already satisfied (use --upgrade to upgrade): ptyprocess>=0.5 in /Library/Python/2.7/site-packages (from pexpect->ipython)
abhi ~ $ ipython
-bash: ipython: command not found