Disable line wrapping as default.
Change g:EasyMotion_leader_key to colon (,) .
Disable source folding by default
Change default Python indentation to 4 spaces.
Change key mapping for c-l and c-h to switch tabs easily.
Add plugin: Syntastic

Syntastic is a syntax checking plugin for Vim that runs files through
external syntax checkers and displays any resulting errors to the user.

Notice that for Python coding style checking, it needs flake8 and pylint
to be installed in $PATH:

  pip install flake8
  pip install pylint

Get more information on https://github.com/scrooloose/syntastic .