擅长:python、mysql、java
<p>像这样:</p>
<pre class="lang-py prettyprint-override"><code> x * y.count(x)
</code></pre>
<p>编辑问题之前获取<code>", String, String, "</code>类答案:</p>
<pre class="lang-py prettyprint-override"><code>def inv_replace(x, y, delim=", "):
pre = delim if y.index(x) else ""
post = delim if y.rindex(x) + len(x) != len(y) else ""
return pre + delim.join([x] * y.count(x)) + post
</code></pre>