擅长:python、mysql、java
<p>使用<a href="http://docs.python.org/2/library/itertools.html#itertools.groupby" rel="noreferrer">^{<cd1>}</a>:</p>
<pre><code>>>> foo = "SSYYNNOOPPSSIISS"
>>> import itertools
>>> ''.join(ch for ch, _ in itertools.groupby(foo))
'SYNOPSIS'
</code></pre>