删除一定大小的文件

import os
import os.path
filePath = input('Enter filepath : ')
size=int(input('Enter the max size you want to delete(KB):'))
#三个参数：分别返回1.父目录 2.所有文件夹名字（不含路径） 3.所有文件名字
for parent ,dirnames , filenames in os.walk(filePath):
#     for dirname in dirnames:                              #这些用不到
#         print( 'parent is :'+parent)                      #这些用不到
#         print ('dirname is '+ dirname                     #这些用不到

    for filename in filenames:
        print('parent is :' + parent)
        print('filename is :' + filename)
        currentPath = os.path.join(parent, filename)
        print('the fulll name of the file is :' + currentPath)
        filesize = os.path.getsize(currentPath) / 1024
        print('the file size is : %.3f KB' % (filesize))
        if filesize<size:
            os.remove(currentPath)