问简单的python通过日志文件搜索脚本是排序的，但在30个文件之后无序完成

EN

import os

os.chdir('/home/user/logs/')
mystr = input('search string: ')


files = sorted(os.listdir('.'),key=os.path.getctime, reverse=True)

def search(start, stop):
    for file in files[start:stop]:
        print(file)
        with open(file, 'r') as infile:
            for line in infile:
                if mystr in line:
                    print(line)


search(0,31) #works
search(0,400) #searches out of order or starts at weird order number.