擅长:python、mysql、java
<p>这是<a href="https://docs.python.org/2/library/functions.html#enumerate" rel="noreferrer">^{<cd1>}</a>的目的!在</p>
<blockquote>
<p><a href="https://docs.python.org/2/library/functions.html#enumerate" rel="noreferrer">enumerate(sequence, start=0)</a></p>
<p>Return an enumerate object. sequence must be a sequence, an iterator, or >some other object which supports iteration. </p>
</blockquote>
<pre><code>>>> seasons = ['Spring', 'Summer', 'Fall', 'Winter']
>>> list(enumerate(seasons))
[(0, 'Spring'), (1, 'Summer'), (2, 'Fall'), (3, 'Winter')]
</code></pre>
<p>在迭代中,您可以:</p>
^{pr2}$