擅长:python、mysql、java
<p>您可以使用<code>itertools.groupby</code>:</p>
<pre><code>import itertools
s = "hhhaaappy"
new_s = [(a, list(b)) for a, b in itertools.groupby(s)]
final_s = ''.join(''.join(b[:-1]) if len(b) > 2 else ''.join(b) for a, b in new_s)
</code></pre>
<p>输出:</p>
^{pr2}$