擅长:python、mysql、java
<p>对于在字符串开头添加0的特殊情况,可以使用<a href="http://python-reference.readthedocs.org/en/latest/docs/str/zfill.html" rel="nofollow">^{<cd1>}</a>:</p>
<pre><code>>>> myList = ["0","12","221","3344"]
>>> [x.zfill(4) for x in myList]
['0000', '0012', '0221', '3344']
</code></pre>