ipython 是一个 python 的交互式 shell，比默认的python shell 好用得多，支持变量自动补全，自动缩进，支持 bash shell 命令，内置了许多很有用的功能和函数。在ubuntu 下只要 sudo apt-get install ipython 就装好了，通过 ipython 启动。-ipython is a python interactive shell, than the default python shell is much more useful to support variable auto-completion, auto-indent, support bash shell command, and built a number of useful features and functions. So long as in ubuntu sudo apt-get install ipython had loaded it through ipython starts.