os.listdir如何排序

>>> files=os.listdir(".")
>>> files.sort()
>>> print files
['1.txt', '10.txt', '11.txt', '2.txt', '3.txt']
>>> files.sort(key= lambda x:int(x[:-4]))
>>> print files
['1.txt', '2.txt', '3.txt', '10.txt', '11.txt']

参考链接：os.listdir