Function
=====


## Some points about function:

1. Must add `:` by the end of the function name with `()`.
													
	functionName():
        function() // above ':' is very necessary

2. Using the right **PATH** of python intepreter for Python.

		#!/usr/bin/env python
  if you don't use it, then you will not run correct unless using `python xxx.py`, instead of `./xxx.py`