擅长:python、mysql、java
<p>您可能希望将<a href="http://docs.python.org/library/collections.html#deque-objects" rel="noreferrer">collections.deque</a>对象与maxlen构造函数参数一起使用:</p>
<pre><code>>>>l = collections.deque(maxlen=5)
>>>l.append('apple')
>>>l.append('orange')
>>>l.append('grape')
>>>l.append('banana')
>>>l.append('mango')
>>>print(l)
deque(['apple','orange','grape','banana','mango'], maxlen=5)
>>>l.append('kiwi')
>>>print(l)
deque(['orange','grape','banana','mango','kiwi'], maxlen=5) #only 5 items in list
</code></pre>