Hello World-從安裝到第一個程序

1. First of all, install python, I chose the latest version 3.7.0a2. 

    Download: https://www.python.org/downloads/mac-osx/

2. Run terminal with command python as below:

3. then you can type python command in terminal directly, as below:

4. exit() can exist python as below:

5. first program: hello world!

    method 1:

    run terminal and type python as below:

    method 2:

    new a document as below:

    then call a command in terminal as below: