#file setting
folder_path = "D:/spider_things/2016.4.6/" + file_name +"/"
if not os.path.exists(folder_path):
os.makedirs(folder_path)

#取文件后缀
> os.path.splitext("/root/a.py")
('/root/a', '.py')
#取目录与文件名
> os.path.split("/root/a.py")
('/root', 'a.py')
> os.path.basename("/root/a.py")
'a.py'
> os.path.dirname('/root/a.py')
'/root'

import os
import sys
path = 'D:/emojis'
# os.walk 返回的是一个三元组
for (path, dirs, files) in os.walk(path):
  for filename in files:
    newname = "emoji_" +filename
    os.rename(os.path.join(path, filename) , os.path.join(path, new_name))