<p>我有一本这样的字典:</p>
<pre><code>user_dict = {
user1: [(video1, 10),(video2,20),(video3,1)]
user2: [(video1, 4),(video2,8),(video6,45)]
...
user100: [(video1, 46),(video2,34),(video6,4)]
}
(video1,10) means (videoid, number of request)
</code></pre>
<p>现在我想随机选择10个用户并做一些计算,比如</p>
<pre><code> 1. calculate number of videoid for each user.
2. sum up the number of requests for these 10 random users, etc
</code></pre>
<p>然后我需要把随机数分别增加到20,30,40</p>
<p>但是“随机选择”一次只能选择一个值,对吧?如何选择多个键以及每个键后面的列表?</p>