擅长:python、mysql、java
<p>您可以使用列表:</p>
<pre><code>d = "ddar astronaut. pldase, stop drasing md!"
new_d = d[0]+''.join(i if i.lower() != 'd' else 'e' for i in d[1:])
</code></pre>
<p>输出:</p>
<pre><code>'dear astronaut. please, stop erasing me!'
</code></pre>