Pre-condition for install mkdocs
1. Check python version
$ python --version
Python 2.7.15rc1
2. Install pip
$ python get-pip.py
$ pip --version
pip 9.0.1 from /usr/lib/python2.7/dist-packages (python 2.7)
3. Installing MkDocs
$ pip install mkdocs
$ mkdocs --version
mkdocs, version 1.0.4 from /usr/local/lib/python2.7/dist-packages/mkdocs (Python 2.7)