Python文件夹备份

import os,shutil

def file_copy(path1,path2):

        f2 = [filename1 for filename1 in os.listdir(path2)]

        for filename in os.listdir(path1):

            if filename  not in f2 :

#判断是否源文件是否在备份文件夹内存在

                path3= os.path.join(path1,filename)

                path4=os.path.join(path2,filename)

                shutil.copy(path3,path4)     

#同步文件