.pop(-1)中的-1怎么理解?

hunsjie

def print_last_word(words):    """Prints the last word after popping it off."""    word = words.pop(-1)    print word https://learn-python-the-hard-way-zh_cn-translation.readthedocs.org/en/latest/ex25.html
如图所示，为什么输出的结果是删除最后一个单词，-1怎么理解？

vose

e.g.  pop(-1) 就是拿掉倒数第一个

1. x=[1,2,3,4,5]
   
2. x.pop(-1)
   
3. print x
   
4. x = [1,2,3,4]

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