擅长:python、mysql、java
<p>这对你有用吗:</p>
<pre><code>In [9]: a = "this is the demonstration sentence."
In [10]: left, _, right = a.strip().partition(' ')
In [11]: mid, _, right = right.rpartition(' ')
In [12]: Left = left.title()
In [13]: Right = right.title()
In [14]: a = a.replace(left, Left, 1).replace(right, Right, 1)
In [15]: a
Out[15]: 'This is the demonstration Sentence.'
</code></pre>