擅长:python、mysql、java
<p>您可以使用<a href="http://docs.python.org/2/library/itertools.html#itertools.groupby" rel="nofollow">^{<cd1>}</a>:</p>
<pre><code>In [53]: strs="goooooooooooood"
In [54]: from itertools import groupby
In [55]: "".join(k*2 if len(list(g))>=2 else k for k,g in groupby(strs))
Out[55]: 'good'
</code></pre>