Python：列表操作(Python: List operations)

 我是100％新的python，我知道我需要阅读更多，但我需要现在就做这个任务，这就是为什么我使用python。 这是我的代码： 
 
outputList = []

for line in open('cron.log', 'r'):
   m = line[45:47]
   outputList.append(m)
 
 所以我打开文件，通过行读取，并追加我需要的2个字符到列表中。 现在我想从end （或列表的beginning ） beginning ，将该位置的element与element before （或behind ）的element进行比较。 我怎样才能做到这一点？ 在C ++中，我会做iterrator ，使用front() ， pop_front()等，但我对python :( 

I am 100% new to python, I know I need to read more but I need to do this task right now that's why I am using python for it. Here is my code:
 
outputList = []

for line in open('cron.log', 'r'):
   m = line[45:47]
   outputList.append(m)
 
So I opened the file, read through lines, and append the 2 chars I need into a list. Now I want to go from the end (or beginning of the list), comparing the element at that position with the element right before (or behind) it. How can I do that? In C++ I would be doing iterrator, using front(), pop_front() or such but I am clueless about python :(

原文：https://stackoverflow.com/questions/6456716