讲解对象：查看模块下面的所有方法
作者：融水公子 rsgz
方法：
C:\Users\Administrator>python
Python
3.7.4 (tags/v3.7.4:e09359112e, Jul 8 2019, 20:34:20) [MSC v.1916 64 bit
(AMD64)] on win32
Type
"help", "copyright", "credits" or
"license" for more information.
>>>
import sys
>>>
print(dir(sys))
[
'__breakpointhook__',
'__displayhook__',
'__doc__',
…
操作截图：
