擅长:python、mysql、java
<p>使用itertools非常简单。</p>
<pre><code>import itertools
alist = [1,2,3]
repeatingGenerator = itertools.cycle(alist)
print(next(generatorInstance)) #=> yields 1
print(next(generatorInstance)) #=> yields 2
print(next(generatorInstance)) #=> yields 3
print(next(generatorInstance)) #=> yields 1 again!
</code></pre>