擅长:python、mysql、java
<p>在合理的情况下,最能满足任务要求的是:</p>
<pre><code>s = 'p55w-r@d'
result = s # Note the change here
for c in set(s): # set(..) is not strictly necessary, but avoids repeated chars
if not c.isalnum():
result = result.replace(c, '*')
</code></pre>