擅长:python、mysql、java
<p>不带<code>re</code>,带<code>itertools.groupby</code>(<a href="https://docs.python.org/3.5/library/itertools.html#itertools.groupby" rel="nofollow noreferrer">doc</a>)的版本:</p>
<pre><code>from itertools import groupby
text="the women marathon unknown introduced at the summer olympics los angeles usa and unknown won"
for v, g in groupby(text.split(), lambda k: k=='unknown'):
if v:
continue
l = [*g]
if len(l) > 1:
print(l[-2:])
</code></pre>
<p>印刷品:</p>
<pre><code>['women', 'marathon']
['usa', 'and']
</code></pre>