擅长:python、mysql、java
<p>这将提供所需的字符串:</p>
<pre><code>cat = '[{}]'.format(','.join('W{}'.format(i) for i in row['weeks']))
# ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
# this gives 'W30', 'W31', etc.
# ^^^^^^^^^
# this joins them with commas: 'W30,W31,...,W40'
# ^^^^^^^^^^^^^^
# this puts [ ] around
</code></pre>