如果值与循环中的前一个值相同，如何停止打印

Question

以下代码将显示文件夹中创建的最新文件的名称及其内容，并且还将保持每 30 秒打印一次。

import glob    
import os      
import time

while True: 

 newest=max(glob.iglob('/Users/BetaBrawler/Downloads/HernanVillela/*'), key=os.path.getctime)

 print newest     
 file = open(newest,'r')     
 texto = [x.strip() for x in file.readlines()]

 print texto     
 time.sleep(30)

我唯一想做的是，如果以下输出与前一个输出具有相同的值（相同的文件及其内容），控制台将停止打印，并且仅在文件夹中创建新文件时才打印。

Answer 1

import glob    
import os      
import time

current = None

while True: 
   newest = max(glob.iglob('/Users/BetaBrawler/Downloads/HernanVillela/*'), key=os.path.getctime)

   if newest != current:
       current = newest
       print newest     
       with open(newest, 'r') as file_:
           texto = [x.strip() for x in file_.readlines()]
           print texto

   time.sleep(30)

Answer 2

import glob
import os
import time

oldfile = None
while True:
    newest = max(glob.glob('/Users/BetaBrawler/Downloads/HernanVillela/*'), key=os.path.getctime)

    if newest == oldfile:
        time.sleep(30)
        continue

    oldfile = newest
    with open(newest) as infile:
        print [line.strip() for line in infile]
    time.sleep(30)