os.listdir()顺序

import os
from  PIL import Image
path = './input'
file_list = os.listdir(path)
for  i in range(len(file_list)):
    print(file_list[i])

import os
from  PIL import Image
path = './input'
file_list = os.listdir(path)
file_list.sort(key= lambda x:int(x[:-4]))#.png所以是[:-4]
for  i in range(len(file_list)):
    print(file_list[i])