通过python将大量文件按修改时间分类的方法

#coding:utf-8
import os
import sys
import os.path
import time
from shutil import Error
from shutil import copystat
from shutil import copy2

path_str = r"D:\pic";

def copy_file(src_file, dst_dir):
 if os.path.isdir(dst_dir): 
  pass;
 else: 
  os.makedirs(dst_dir);
 print(src_file);
 print(dst_dir);
 copy2(src_file, dst_dir) 

def walk_file(file_path):
 for root, dirs, files in os.walk(file_path, topdown=False):
  for name in files:
   com_name = os.path.join(root, name);
   t=os.stat(com_name);
   copy_path_str = path_str+r"\year"+str(time.localtime(t.st_mtime).tm_year)+r"\month"+str(time.localtime(t.st_mtime).tm_mon);
   print(copy_path_str);
   copy_file(com_name,copy_path_str); 
  for name in dirs:
   walk_file(name);

walk_file(path_str);