object_name? | 查看方法描述
%line magics | 行魔术方法
%%Cell magics | 块魔术方法
!shell | 执行系统命令
Functions that work with code: %run, %edit, %save, %macro, %recall, etc.
Functions which affect the shell: %colors, %xmode, %automagic, etc.
Other functions such as %reset, %timeit, %%writefile, %load, or %paste.