>>> import os
>>> import sys
>>> out=sys.stdout
>>> sys.stdout=open('help.txt','a')
>>> dir(sys)
>>> sys.stdout.close()
>>> sys.stdout=out
>>> sys.stdout=open('help.txt','a')
>>> sys.path
>>> help(sys.path)
>>> import math
>>> dir(math)
>>> help(math)
>>> sys.stdout.close()
>>>
结果在help.TXT文件内